Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00

HELECTRICITY H03Electronic circuits H03FAMPLIFIERS

H03F2203/00Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00

H03F2203/20Indexing scheme relating to power amplifiers H03F2203/21with semiconductor devices only H03F2203/211using a combination of several amplifiers H03F2203/21103An impedance adaptation circuit being added at the input of a power amplifier stage H03F2203/21106An input signal being distributed in parallel over the inputs of a plurality of power amplifiers H03F2203/21109An input signal being distributed by switching to a plurality of paralleled power amplifiers H03F2203/21112An filter circuit being added at the input of a power amplifier stage H03F2203/21115An input signal dependant signal being measured by current measuring at the input of a power amplifier H03F2203/21118An input signal dependant signal being measured by power measuring at the input of a power amplifier H03F2203/21121An input signal dependant signal being measured by voltage measuring at the input of a power amplifier H03F2203/21124A parallel resonance circuit being coupled at the input of a power amplifier H03F2203/21127the input bias current of a power amplifier being controlled H03F2203/21131the input bias voltage of a power amplifier being controlled H03F2203/21133A series resonance circuit being coupled at the input of a power amplifier H03F2203/21136An input signal of a power amplifier being on/off switched H03F2203/21139An impedance adaptation circuit being added at the output of a power amplifier stage H03F2203/21142Output signals of a plurality of power amplifiers are parallel combined to a common output H03F2203/21145Output signals are combined by switching a plurality of paralleled power amplifiers to a common output H03F2203/21148An output signal of a power amplifier being controlled by controlling current signal H03F2203/21151An output signal of a power amplifier being controlled by controlling power signal H03F2203/21154An output signal of a power amplifier being controlled by controlling voltage signal H03F2203/21157A filter circuit being added at the output of a power amplifier stage H03F2203/21161An output signal dependant signal being measured by current measuring at the output of a power amplifier H03F2203/21163An output signal dependant signal being measured by power measuring H03F2203/21166An output signal dependant signal being measured by voltage measuring at the output of a power amplifier H03F2203/21169A parallel resonance circuit being coupled at the output of a power amplifier H03F2203/21172A series resonance circuit being coupled at the output of a power amplifier H03F2203/21175An output signal of a power amplifier being on/off switched H03F2203/21178Power transistors are made by coupling a plurality of single transistors in parallel H03F2203/21181the supply current of a power amplifier being continuously controlled H03F2203/21184the supply current of a power amplifier being continuously measured H03F2203/21187the supply current of a power amplifier being measured discontinuously in time H03F2203/21191the supply current of a power amplifier being switchable controlled H03F2203/21193the supply voltage of a power amplifier being continuously controlled H03F2203/21196the supply voltage of a power amplifier being switchable controlled H03F2203/30Indexing scheme relating to single-ended push-pull [SEPP] Phase-splitters therefor H03F2203/30003the SEPP amplifier stage comprising calibration possibility H03F2203/30006the push and the pull stages of the SEPP amplifier are both current mirrors H03F2203/30009the push and pull stages of the SEPP amplifier are both cascode current mirrors H03F2203/30012the two SEPP amplifying transistors are Darlington composite transistors H03F2203/30015An input signal dependent control signal controls the bias of an output stage in the SEPP H03F2203/30018A series coupled active resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier H03F2203/30021A capacitor being coupled in a feedback circuit of a SEPP amplifier H03F2203/30024the SEPP bias current being controlled by a control signal from a feedback circuit H03F2203/30027the SEPP bias voltage being controlled by a control signal from a feedback circuit H03F2203/30031A resistor being coupled as feedback circuit in the SEPP amplifier H03F2203/30033A series coupled resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier H03F2203/30036A feedback circuit to stabilise the SEPP being used H03F2203/30039the SEPP bias current being controlled by a control signal from a feedforward circuit H03F2203/30042the SEPP bias voltage being controlled by a control signal from a feedforward circuit H03F2203/30045the SEPP power transistors comprising measuring push or pull transistors to produce a controlling signal H03F2203/30048the SEPP amplifier has multiple SEPP outputs from paralleled output stages coupled in one or more outputs H03F2203/30051the SEPP amplifying transistors are composed of multiple coupled transistors H03F2203/30054the SEPP power transistors are realised as paralleled cascode coupled transistors H03F2203/30057the SEPP power transistors are realised as paralleled FETs H03F2203/30061One or more current mirrors are used as bias circuit or stages for the push or pull stages H03F2203/30063A differential amplifier being used in the bias circuit or in the control circuit of the SEPP-amplifier H03F2203/30066A optical element being used in the bias circuit of the SEPP-amplifier H03F2203/30069A SEPP amplifier with a reactive element in the bias circuit H03F2203/30072the SEPP has a power supply switchable by a controlling signal derived from the input signal H03F2203/30075the SEPP has a power supply switchable by a controlling signal derived from the output signal H03F2203/30078A resistor being added in the pull stage of the SEPP amplifier H03F2203/30081the pull transistor circuit comprising one or more capacitors H03F2203/30084the pull circuit of the SEPP amplifier being a cascode circuit H03F2203/30087Only the bias of the pull transistor of the SEPP being dynamically controlled by the input signal H03F2203/30091the pull side of the SEPP amplifier has an extra drive follower stage to control this pull side H03F2203/30093the pull side of the SEPP amplifier has an extra drive inverter stage to control this pull side H03F2203/30096An op amp being used as extra drive amp for the pull side of the SEPP H03F2203/30099the pull transistor being gated by a switching element H03F2203/30102the pull transistor has a measuring transistor for controlling purposes H03F2203/30105the pull transistor of the asymmetrically driven SEPP amplifier being a driven current mirror H03F2203/30108the pull transistor of the SEPP amplifier being a cascode current mirror H03F2203/30111A resistor being added in the push stage of the SEPP amplifier H03F2203/30114the push transistor circuit comprising one or more capacitors H03F2203/30117the push circuit of the SEPP amplifier being a cascode circuit H03F2203/30121Only the bias of the push transistor of the SEPP being dynamically controlled by the input signal H03F2203/30123the push side of the SEPP amplifier has an extra drive follower stage to control this push side H03F2203/30126the push side of the SEPP amplifier has an extra drive inverter stage to control this push side H03F2203/30129An op amp being used as extra drive amp for the push side of the SEPP H03F2203/30132the push transistor being gated by a switching element H03F2203/30135the push transistor has a measuring transistor for controlling purposes H03F2203/30138the push transistor of the asymmetrically driven SEPP amplifier being a driven current mirror H03F2203/30141the push transistor of the SEPP amplifier being a cascode current mirror H03F2203/30144the SEPP comprising a reactive element in the amplifying circuits H03F2203/30147the current sink of the push driven H03F2203/30151the current sink of the push driven H03F2203/30153the current source of the pull driven H03F2203/30156the current source of the pull driven H03F2203/45Indexing scheme relating to differential amplifiers H03F2203/45002the addition of two signals being made by addition of two currents by coupling the outputs of two current mirrors in parallel H03F2203/45004the addition of two signals being made by addition of two currents by coupling two current sources in parallel H03F2203/45006the addition of two signals being made by two emitter or source coupled followers H03F2203/45008the addition of two signals being made by a resistor addition circuit for producing the common mode signal H03F2203/45011the addition of two signals being made in a source degeneration circuit of a current mirror for producing the common mode signal H03F2203/45012the addition of two signals being made in a switched capacitor circuit for producing the common mode signal H03F2203/45014the addition of two signals being made in the tail circuit of a differential amplifier for producing the common mode signal H03F2203/45016the addition of two signals being made by paralleling two triode biased transistors for producing the common mode signal H03F2203/45018the differential amplifier amplifying transistors have added cross couplings H03F2203/45021One or more added diodes to the amplifying transistors in the differential amplifier H03F2203/45022One or more added resistors to the amplifying transistors in the differential amplifier H03F2203/45024the differential amplifier amplifying transistors are cascode coupled transistors H03F2203/45026One or more current sources are added to the amplifying transistors in the differential amplifier H03F2203/45028the differential amplifier amplifying transistors are folded cascode coupled transistors H03F2203/45031the differential amplifier amplifying transistors are compositions of multiple transistors H03F2203/45032the differential amplifier amplifying transistors are multiple paralleled transistors H03F2203/45034One or more added reactive elements, capacitive or inductive elements, to the amplifying transistors in the differential amplifier H03F2203/45036the differential amplifier amplifying transistors are single transistors H03F2203/45038One or more current sources are added or changed as balancing means to reduce the offset of the dif amp H03F2203/45041Fuses are blown to balance the dif amp to reduce the offset of the dif amp H03F2203/45042One or more resistors are added or changed as balancing to reduce the offset of the dif amp H03F2203/45044One or more switches are opened or closed to balance the dif amp to reduce the offset of the dif amp H03F2203/45046the base current of the amplifying transistors of a dif amp being compensated for providing a greater input impedance of the amplifier H03F2203/45048Calibrating and standardising a dif amp H03F2203/45051Two or more differential amplifiers cascade coupled H03F2203/45052the cascode stage of the cascode differential amplifier being controlled by a controlling signal, which controlling signal can also be the input signal H03F2203/45054the cascode stage of the cascode dif amp being a current mirror H03F2203/45056One or both transistors of the cascode stage of a differential amplifier being composed of more than one transistor H03F2203/45058the cascode stage of the differential amplifier comprising a reactive element H03F2203/45061the common mode reference signal being taken or deducted from the one or more inputs of the differential amplifier H03F2203/45062the common mode signal H03F2203/45064the resulting deducted common mode signal being added to the folding circuit of the folded differential amplifier H03F2203/45066the resulting deducted common mode signal being added at the one or more inputs of the differential amplifier H03F2203/45068the resulting deducted common mode signal being added at the one or more outputs of the differential amplifier H03F2203/45071the resulting deducted common mode signal being added at the substrate or body regions of the components of the differential amplifier H03F2203/45072the common mode voltage or current signal being added to the tail circuit of the differential amplifier H03F2203/45074A comparator circuit compares the common mode signal to a reference before controlling the differential amplifier or related stages H03F2203/45076the resulting deducted common mode signal being added to or controls the differential amplifier, and being a current signal H03F2203/45078the common mode signal being taken or deducted from the one or more inputs of the differential amplifier H03F2203/45081the common mode signal being level shifted before using it for controlling or adding H03F2203/45082the common mode signal being taken or deducted from the one or more outputs of the differential amplifier H03F2203/45084the common mode signal circuit comprising one or more inductive or capacitive elements H03F2203/45086the common mode signal being taken or deducted from the tail circuit of the differential amplifier H03F2203/45088the resulting deducted common mode signal being added to or controls the differential amplifier, and being a voltage signal H03F2203/45091Two complementary type differential amplifiers are paralleled H03F2203/45092Two current sources bias one set of two common base transistors cascaded with two other common base transistors, the common base transistors being driven complementary H03F2203/45094the dif amp being realized by coupling the emitters respectively sources of two common collector respectively drain transistors of a first type to the emitters respectively sources of two common base respectively gate transistors of a second complementary type H03F2203/45096the difference of two signals being made by H03F2203/45098Two current mirrors coupled in a subtracting configuration H03F2203/45101Control of the DC level being present H03F2203/45102A diode being used as clamping element at the input of the dif amp H03F2203/45104A diode being used as clamping element at the loading circuit of the dif amp H03F2203/45106A diode being used as clamping element at the output of the dif amp H03F2203/45108A diode being used as level shifter between stages or in a follower in relation with a dif amp H03F2203/45111Two dif amps of the same type are used one dif amp for each input signal H03F2203/45112the biasing of the differential amplifier being controlled from the input or the output signal H03F2203/45114the differential amplifier contains another differential amplifier in its feedback circuit H03F2203/45116Feedback coupled to the input of the differential amplifier H03F2203/45118At least one reactive element being added to at least one feedback circuit of a dif amp H03F2203/45121A floating gate element being part of a dif amp H03F2203/45122the folded cascode stage of the folded cascode differential amplifier being controlled by a controlling signal H03F2203/45124the folded cascode stage of the folded cascode dif amp being a current mirror H03F2203/45126One or both transistors of the folded cascode stage of a folded cascode dif amp are composed of more than one transistor H03F2203/45128the folded cascode stage of the folded cascode dif amp contains a reactive element H03F2203/45131A follower being added between the dif amp and other explicit stages in the amplifying circuit H03F2203/45132A source follower using multiple single follower stages cascaded in a composed follower being added to the dif amp H03F2203/45134the whole differential amplifier together with other coupled stages being fully differential realised H03F2203/45136One differential amplifier in IC-block form being shown H03F2203/45138Two or more differential amplifiers in IC-block form are combined H03F2203/45141A cross coupled pair of transistors being added in the input circuit of a differential amplifier H03F2203/45142At least one diode being added at the input of a dif amp H03F2203/45144At least one follower being added at the input of a dif amp H03F2203/45146At least one op amp being added at the input of a dif amp H03F2203/45148At least one reactive element being added at the input of a dif amp H03F2203/45151At least one resistor being added at the input of a dif amp H03F2203/45152Balancing means being added at the input of a dif amp to reduce the offset of the dif amp H03F2203/45154the bias at the input of the amplifying transistors being controlled H03F2203/45156At least one capacitor being added at the input of a dif amp H03F2203/45158One or more diodes coupled at the inputs of a dif amp as clamping elements H03F2203/45161One or more diodes coupled at the inputs of a dif amp as level shifting circuit elements H03F2203/45162A parallel resonance circuit being added in the one or more input circuits of the dif amp H03F2203/45164A series resonance circuit being added in the one or more input circuits of the dif amp H03F2203/45166Only one input of the dif amp being used for an input signal H03F2203/45168A dif amp being used as input stage to one or more other non-differential stages H03F2203/45171the input signal being switched to the one or more input terminals of the differential amplifier H03F2203/45172A transformer being added at the input of the dif amp H03F2203/45174the application of the differential amplifier being in an integrator circuit H03F2203/45176A cross coupling circuit H03F2203/45178the differential amplifier contains one or more extra resistors in the active load circuit H03F2203/45181Compensation of unbalanced loading in dif amps H03F2203/45182the differential amplifier contains one or more cascode current mirrors in the load H03F2203/45184the differential amplifier has one or more cascode current sources in the load H03F2203/45186the differential amplifier contains clamping components in the load circuit H03F2203/45188the differential amplifier contains one or more current sources in the load H03F2203/45191One or more diodes not belonging to a current mirror as loads of a dif amp H03F2203/45192the differential amplifier contains current mirrors comprising diodes which act as a load for the differential amplifier H03F2203/45194At least one active load circuit of the two load circuits in a differential amplifier being realised with a combination of more than one transistor H03F2203/45196A differential amplifier with one or more parallel coupled LC-circuits as load H03F2203/45198A parallel resonance circuit being added in the one or more load circuits of the dif amp H03F2203/45201the differential amplifier contains one or more reactive elements H03F2203/45202the differential amplifier contains only resistors in the load H03F2203/45204A series resonance circuit being added in the one or more load circuits of the dif amp H03F2203/45206One or two switches are coupled in the loading circuit of the dif amp H03F2203/45208the dif amp being of the long tail pair type, one current source being coupled to the common emitter of the amplifying transistors H03F2203/45211the amplifying transistors have multiple collectors with a cross coupling H03F2203/45212the differential amplifier being designed to have a reduced offset H03F2203/45214Offset in a differential amplifier being reduced by control of the substrate voltage, the voltage being either fixed or variable H03F2203/45216A cross coupling circuit being added at the output terminals of the amplifying transistors of a differential amplifier H03F2203/45218Diode clamping means are present at the output of a differential amplifier H03F2203/45221the output signal being taken from the two complementary outputs of the differential amplifier H03F2203/45222the differential amplifier output being directly controlled by a feedback or feedforward circuit coupled at the output of the dif amp H03F2203/45224One output of the differential amplifier being taken into consideration H03F2203/45226the output signal being switched taken from the one or more output terminals of the differential amplifier H03F2203/45228A transformer being added at the output or the load circuit of the dif amp H03F2203/45231Two dif amps of the cascode type are paralleled at their input gates or bases H03F2203/45232Two dif amps of the folded cascode type are paralleled at their input gates or bases H03F2203/45234Two dif amps, one of them being of the cascade type and the other one of the folded cascade type, are paralleled at their input gates or bases H03F2203/45236Two dif amps realised in MOS or JFET technology, one of them being of the p-channel type and the other one of the n-channel type, are coupled in parallel with their gates H03F2203/45238Two dif amps realised in FET technology, the dif amps being either both of the NMOS type or both of the PMOS type, are coupled in parallel with their gates and their drains H03F2203/45241Two dif amps realised in MOS or JFET technology, the dif amps being either both of the p-channel type or both of the n-channel type, are coupled in parallel with their gates H03F2203/45242Two dif amps are paralleled at their inputs, the dif amps being of different types H03F2203/45244the differential amplifier contains one or more explicit bias circuits H03F2203/45246the dif amp being biased in the subthreshold region H03F2203/45248the dif amp being designed for improving the slew rate H03F2203/45251the dif amp has a cross coupling circuit in the source circuit of the amplifying transistors H03F2203/45252Diodes are added in the source circuit of the amplifying FETs of the dif amp H03F2203/45254A parallel resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp H03F2203/45256One or more reactive elements are added in the source circuit of the amplifying FETs of the dif amp H03F2203/45258Resistors are added in the source circuit of the amplifying FETs of the dif amp H03F2203/45261A series resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp H03F2203/45262the two amplifying FETs, amplifying two complementary input signals, are not source coupled H03F2203/45264the dif amp comprising frequency or phase stabilisation means H03F2203/45266the stage cascaded to the dif amp being an asymmetrical follower stage H03F2203/45268A common gate stage being coupled at the one or more outputs of the dif amp H03F2203/45271the output current being reduced by a transistor which being controlled by the input signal to sink current H03F2203/45272the output current being increased by a transistor which being controlled by the input signal to source current H03F2203/45274Level shifting stages are added to the differential amplifier at a position other than the one or more inputs of the dif amp H03F2203/45276An op amp as stage being coupled to the output of a dif amp H03F2203/45278Two SEPP stages are added to the differential amplifier, the outputs of the two SEPP stages being the two outputs of the whole amplifier H03F2203/45281One SEPP output stage being added to the differential amplifier H03F2203/45282the differential amplifier being coupled to a symmetrical follower output stage H03F2203/45284Sensing the temperature dependence by a temperature dependant sensor H03F2203/45286the temperature dependence of a differential amplifier being controlled H03F2203/45288Differential amplifier with circuit arrangements to enhance the transconductance H03F2203/45291the active amplifying circuit [AAC] comprising balancing means H03F2203/45292the AAC comprising biasing means controlled by the signal H03F2203/45294the AAC comprising biasing means to stabilise itself H03F2203/45296the AAC comprising one or more discrete capacitive elements H03F2203/45298the AAC comprising one or more combinations of discrete capacitor and resistor elements H03F2203/45301there are multiple cascaded folded or not folded common gate stages of a cascode dif amp H03F2203/45302the common gate stage of a cascode dif amp being controlled H03F2203/45304the common gate stage of a BIFET cascode dif amp being implemented fully by FETs H03F2203/45306the common gate stage implemented as dif amp eventually for cascode dif amp H03F2203/45308the common gate stage of a cascode dif amp being implemented as one mirror circuit H03F2203/45311the common gate stage of a cascode dif amp being implemented by multiple transistors H03F2203/45312there being only one common gate stage of a cascode dif amp H03F2203/45314the AAC comprising clamping means H03F2203/45316the AAC comprising one or more discrete inductive elements or coils H03F2203/45318the AAC comprising a cross coupling circuit H03F2203/45321the common source stage of a BIFET cascode dif amp being implemented fully by FETs H03F2203/45322One or more current sources are added to the AAC H03F2203/45324the AAC comprising a Darlington transistor circuit H03F2203/45326the AAC comprising one or more extra diodes H03F2203/45328the AAC comprising one diode coupled AAC-transistor in a follower combination with the other AAC circuit part H03F2203/45331the AAC comprising one or more diodes coupled as a shunt between the AAC-transistors in the AAC H03F2203/45332the AAC comprising one or more capacitors as feedback circuit elements H03F2203/45334the AAC comprising one or more dif amps as feedback circuit elements H03F2203/45336the AAC comprising one or more resistors as feedback circuit elements H03F2203/45338the AAC comprising one or more series circuits of a resistor and a capacitor as feedback circuit elements H03F2203/45341the AAC comprising controlled floating gates H03F2203/45342the AAC comprising control means on a back gate of the AAC H03F2203/45344At least one of the AAC sub-circuits being a current mirror H03F2203/45346the AAC comprising one or more FETs with multiple drains H03F2203/45348the AAC comprising one or more FETs with multiple gates H03F2203/45351the AAC comprising one or more FETs with multiple sources H03F2203/45352the AAC comprising a combination of a plurality of transistors H03F2203/45354the AAC comprising offset means H03F2203/45356the AAC comprising one or more op-amps H03F2203/45358the AAC comprising multiple transistors parallel coupled at their sources and drains only H03F2203/45361the AAC comprising multiple transistors parallel coupled at their drains only H03F2203/45362the AAC comprising multiple transistors parallel coupled at their gates and drains only H03F2203/45364the AAC comprising multiple transistors parallel coupled at their gates and sources only H03F2203/45366the AAC comprising multiple transistors parallel coupled at their gates only H03F2203/45368the AAC comprising multiple transistors parallel coupled at their sources only H03F2203/45371the AAC comprising parallel coupled multiple transistors at their source and gate and drain or at their base and emitter and collector H03F2203/45372the AAC comprising one or more potentiometers H03F2203/45374the AAC comprising one or more discrete resistors H03F2203/45376the AAC comprising one or more discrete resistors as shunts between collectors or drains H03F2203/45378the AAC comprising saturation or cutoff avoiding means H03F2203/45381the AAC comprising multiple transistors coupled in shunt H03F2203/45382the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling H03F2203/45384the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling in which the common gate stage being controlled H03F2203/45386the AAC comprising one or more coils in the source circuit H03F2203/45388the AAC comprising diodes in the source circuit of the AAC before the common source coupling H03F2203/45391the AAC comprising potentiometers in the source circuit of the AAC before the common source coupling H03F2203/45392the AAC comprising resistors in the source circuit of the AAC before the common source coupling H03F2203/45394the AAC of the dif amp comprising FETs whose sources are not coupled H03F2203/45396the AAC comprising one or more switches H03F2203/45398the AAC comprising a voltage generating circuit as bias circuit for the AAC H03F2203/45401the common mode controlling loop [CMCL] comprising a transistor resistor addition circuit H03F2203/45402the CMCL comprising a buffered addition circuit, i.e. the signals are buffered before addition H03F2203/45404the CMCL comprising capacitors containing, not in parallel with the resistors, an addition circuit H03F2203/45406the CMCL comprising a common source node of a long tail FET pair as an addition circuit H03F2203/45408the CMCL comprising a short circuited differential output of a dif amp as an addition circuit H03F2203/45411the CMCL comprising a diode addition circuit H03F2203/45412the CMCL comprising a folding circuit as addition circuit H03F2203/45414the CMCL comprising a current mirror addition circuit H03F2203/45416the CMCL comprising no addition of the dif signals to produce a common mode signal H03F2203/45418the CMCL comprising a resistor addition circuit H03F2203/45421the CMCL comprising a switched capacitor addition circuit H03F2203/45422the CMCL comprising one or more capacitors not as integrating capacitor H03F2203/45424the CMCL comprising a comparator circuit H03F2203/45426the CMCL comprising a comparator circuit with extra buffering means before comparison of the common mode signal H03F2203/45428the CMCL comprising a comparator circuit using a four inputs dif amp H03F2203/45431the CMCL output control signal being a current signal H03F2203/45432the CMCL output control signal being a current signal and being buffered before used to control H03F2203/45434the CMCL output control signal being a voltage signal H03F2203/45436the CMCL output control signal being a voltage signal and being buffered before used to control H03F2203/45438the CMCL uses digital signals H03F2203/45441the CMCL comprising an integrating circuit H03F2203/45442the CMCL comprising multiple loops for the same stage or for different stages in the amplifier H03F2203/45444the CMCL comprising a sample and hold circuit H03F2203/45446there are two or more CMCLs H03F2203/45448the common source circuit [CSC] comprising an addition circuit made by mirrors H03F2203/45451the CSC comprising an addition circuit made by added current sources H03F2203/45452the CSC comprising balancing means H03F2203/45454the CSC comprising biasing means controlled by the input signal H03F2203/45456the CSC comprising bias stabilisation means H03F2203/45458the CSC comprising one or more capacitors H03F2203/45461the CSC comprising one or more switched capacitors H03F2203/45462the CSC comprising a cascode circuit H03F2203/45464the CSC comprising one or more coils H03F2203/45466the CSC being controlled H03F2203/45468the CSC comprising a cross coupling circuit H03F2203/45471the CSC comprising one or more extra current sources H03F2203/45472the CSC comprising one or more diodes H03F2203/45474the CSC comprising controlled one or more floating gates H03F2203/45476the CSC comprising a mirror circuit H03F2203/45478the CSC comprising a cascode mirror circuit H03F2203/45481the CSC comprising only a direct connection to the supply voltage, no other components being present H03F2203/45482the CSC comprising offset means H03F2203/45484the CSC comprising one or more op-amps H03F2203/45486the CSC comprising two or more paralleled transistors as current source H03F2203/45488the CSC being a pi circuit and a capacitor being used at the place of the resistor H03F2203/45491the CSC being a pi circuit and the resistor being implemented by one or more transistors H03F2203/45492the CSC being a pi circuit and the resistor being implemented by one or more controlled transistors H03F2203/45494the CSC comprising one or more potentiometers H03F2203/45496the CSC comprising one or more extra resistors H03F2203/45498the CSC comprising only resistors H03F2203/45501the CSC comprising a L-C parallel resonance circuit H03F2203/45502the CSC comprising a L-C series resonance circuit H03F2203/45504the CSC comprising more than one switch H03F2203/45506the CSC comprising only one switch H03F2203/45508the CSC comprising a voltage generating circuit as bias circuit for the CSC H03F2203/45511the feedback circuit [FBC] comprising one or more transistor stages H03F2203/45512the FBC comprising one or more capacitors, not being switched capacitors, and being coupled between the LC and the IC H03F2203/45514the FBC comprising one or more switched capacitors, and being coupled between the LC and the IC H03F2203/45516the FBC comprising a coil and being coupled between the LC and the IC H03F2203/45518the FBC comprising one or more diodes and being coupled between the LC and the IC H03F2203/45521the FBC comprising op amp stages H03F2203/45522the FBC comprising one or more potentiometers H03F2203/45524the FBC comprising one or more active resistors and being coupled between the LC and the IC H03F2203/45526the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC H03F2203/45528the FBC comprising one or more passive resistors and being coupled between the LC and the IC H03F2203/45531the FBC comprising a parallel resonance circuit and being coupled between the LC and the IC H03F2203/45532the FBC comprising a series resonance circuit and being coupled between the LC and the IC H03F2203/45534the FBC comprising multiple switches and being coupled between the LC and the IC H03F2203/45536the FBC comprising a switch and being coupled between the LC and the IC H03F2203/45538the IC comprising balancing means H03F2203/45541the IC comprising dynamic biasing means H03F2203/45542the IC comprising bias stabilisation means H03F2203/45544the IC comprising one or more capacitors H03F2203/45546the IC comprising one or more capacitors feedback coupled to the IC H03F2203/45548the IC comprising one or more capacitors as shunts to earth or as short circuit between inputs H03F2203/45551the IC comprising one or more switched capacitors H03F2203/45552the IC comprising clamping means H03F2203/45554the IC comprising one or more coils H03F2203/45556the IC comprising a common gate stage as input stage to the dif amp H03F2203/45558the IC being coupled at the sources of the source coupled pair H03F2203/45561the IC being controlled H03F2203/45562the IC comprising a cross coupling circuit H03F2203/45564the IC comprising one or more extra current sources H03F2203/45566the IC comprising one or more dif stages in cascade with the dif amp H03F2203/45568the IC comprising one or more diodes as shunt to the input leads H03F2203/45571the IC comprising two diodes H03F2203/45572the IC comprising one or more Zener diodes to the input leads H03F2203/45574the IC comprising four or more input leads connected to four or more AAC-transistors H03F2203/45576the IC comprising input impedance adapting or controlling means H03F2203/45578the IC comprising one or more diodes as level shifters H03F2203/45581the IC comprising one or more resistors as level shifters H03F2203/45582the IC comprising one or more voltage sources as level shifters H03F2203/45584the IC comprising extra differentially coupled transistors for controlling purposes only H03F2203/45586the IC comprising offset generating means H03F2203/45588the IC comprising offset compensating means H03F2203/45591the IC comprising one or more potentiometers H03F2203/45592the IC comprising one or more buffer stages other than emitter or source followers between the input signal leads and input leads of the dif amp H03F2203/45594the IC comprising one or more resistors, which are not biasing resistor H03F2203/45596the IC comprising one or more biasing resistors H03F2203/45598the IC comprising an input shunting circuit comprising a resistor and a capacitor in series H03F2203/45601the IC comprising one or more passive resistors by feedback H03F2203/45602the IC comprising one or more active resistors by feedback H03F2203/45604the IC comprising a input shunting resistor H03F2203/45606the IC comprising one or more parallel resonance circuits H03F2203/45608the IC comprising one or more series resonance circuits H03F2203/45611the IC comprising only one input signal connection lead for one phase of the signal H03F2203/45612the IC comprising one or more input source followers as input stages in the IC H03F2203/45614the IC comprising two cross coupled switches H03F2203/45616the IC comprising more than one switch, which are not cross coupled H03F2203/45618the IC comprising only one switch H03F2203/45621the IC comprising a transformer for phase splitting the input signal H03F2203/45622the IC comprising an voltage generating circuit H03F2203/45624the LC comprising balancing means H03F2203/45626the LC comprising biasing means controlled by the input signal H03F2203/45628the LC comprising bias stabilisation means H03F2203/45631the LC comprising one or more capacitors H03F2203/45632the LC comprising one or more capacitors coupled to the LC by feedback H03F2203/45634the LC comprising one or more switched capacitors H03F2203/45636the LC comprising clamping means H03F2203/45638the LC comprising one or more coils H03F2203/45641the LC being controlled H03F2203/45642the LC, and possibly also cascaded stages following it, being (are) controlled by the common mode signal derived to control a dif amp H03F2203/45644the LC comprising a cross coupling circuit H03F2203/45646the LC comprising an extra current source H03F2203/45648the LC comprising two current sources, which are not cascode current sources H03F2203/45651the LC comprising two cascode current sources H03F2203/45652the LC comprising one or more further dif amp stages, either identical to the dif amp or not, in cascade H03F2203/45654the LC comprising one or more extra diodes not belonging to mirrors H03F2203/45656the LC comprising one diode of a current mirror H03F2203/45658the LC comprising two diodes of current mirrors H03F2203/45661the LC comprising one or more controlled floating gates H03F2203/45662the LC comprising inductive coupled loading elements H03F2203/45664the LC comprising one or more cascaded inverter stages as output stage at one output of the dif amp circuit H03F2203/45666the LC comprising two anti-phase controlled inverter circuits as output stages H03F2203/45668the LC comprising a level shifter circuit, which does not comprise diodes H03F2203/45671the LC comprising one or more diodes as level shifter H03F2203/45672the LC comprising one or more resistors as level shifter H03F2203/45674the LC comprising one current mirror H03F2203/45676the LC comprising one cascode current mirror H03F2203/45678the LC comprising offset generating means H03F2203/45681the LC comprising offset compensating means H03F2203/45682the LC comprising one or more op-amps H03F2203/45684the LC comprising one or more buffers or driving stages not being of the emitter respectively source follower type, between the output of the dif amp and the output stage H03F2203/45686the LC comprising one or more potentiometers, which are not shunting potentiometers H03F2203/45688the LC comprising one or more shunting potentiometers H03F2203/45691the LC comprising one or more transistors as active loading resistors H03F2203/45692the LC comprising one or more resistors in series with a capacitor coupled to the LC by feedback H03F2203/45694the LC comprising more than one shunting resistor H03F2203/45696the LC comprising more than two resistors H03F2203/45698the LC comprising one or more resistors coupled to the LC by feedback (active or passive) H03F2203/45701the LC comprising one resistor H03F2203/45702the LC comprising two resistors H03F2203/45704the LC comprising one or more parallel resonance circuits H03F2203/45706the LC comprising one or more series resonance circuits H03F2203/45708the LC comprising one SEPP circuit as output stage H03F2203/45711the LC comprising two anti-phase controlled SEPP circuits as output stages H03F2203/45712the LC comprising a capacitor as shunt H03F2203/45714the LC comprising a coil as shunt H03F2203/45716the LC comprising a RC-series circuit as shunt H03F2203/45718the LC comprising a resistor as shunt H03F2203/45721the LC comprising only an output circuit for one phase of the signal H03F2203/45722the LC comprising one or more source followers, as post buffer or driver stages, in cascade in the LC H03F2203/45724the LC comprising two cross coupled switches H03F2203/45726the LC comprising more than one switch, which are not cross coupled H03F2203/45728the LC comprising one switch H03F2203/45731the LC comprising a transformer H03F2203/45732the LC comprising a voltage generating circuit H03F2203/50Indexing scheme relating to amplifiers in which input being applied to, or output being derived from, an impedance common to input and output circuits of the amplifying element H03F2203/5003the sources of two source followers are differentially coupled H03F2203/5006the input signal being capacitively coupled to the gate of the source follower H03F2203/5009the output signal being capacitively coupled to the source of the source follower H03F2203/5012the source follower has a controlled source circuit, the controlling signal being derived from the drain circuit of the follower H03F2203/5015the source follower has a controlled source circuit, the controlling signal being derived from the gate circuit of the follower H03F2203/5018the source follower has a controlled source circuit, the controlling signal being derived from the source circuit of the follower H03F2203/5021the source follower has a controlled source circuit H03F2203/5024the source follower has a controlled source circuit, the source circuit being controlled via a capacitor H03F2203/5027the source follower has a current mirror output circuit in its source circuit H03F2203/5031the source circuit of the follower being a current source H03F2203/5033Two source followers are controlled at their inputs by a differential signal H03F2203/5036the source follower has a resistor in its source circuit H03F2203/5039the source circuit of the follower has one or more capacitors between source and supply H03F2203/5042the source circuit of the follower has one or more coils between source and supply H03F2203/5045the source follower has a level shifter between source and output H03F2203/72Indexing scheme relating to gated amplifiers H03F2203/7203the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias current in the amplifier H03F2203/7206the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias voltage in the amplifier H03F2203/7209the gated amplifier being switched from a first band to a second band H03F2203/7212the gated amplifier being switched on or off by switching off or on a feedback control loop of the amplifier H03F2203/7215the gated amplifier being switched on or off by a switch at the input of the amplifier H03F2203/7218the gated amplifier being switched on or off by clamping by a switch at the input of the amplifier H03F2203/7221the gated amplifier being switched on or off by a switch at the output of the amplifier H03F2203/7224the gated amplifier being switched on or off by clamping by a switch at the output of the amplifier H03F2203/7227the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier H03F2203/7231the gated amplifier being switched on or off by putting into cascade or not, by choosing between amplifiers by one or more switch(es) H03F2203/7233the gated amplifier, switched on or off by putting into parallel or not, by choosing between amplifiers by one or more switch(es), being impedance adapted by switching an adapted passive network H03F2203/7236the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es) H03F2203/7239the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers and shunting lines by one or more switch(es)