Indexing scheme relating to amplifiers

HELECTRICITY H03Electronic circuits H03FAMPLIFIERS

H03F2200/00Indexing scheme relating to amplifiers

H03F2200/03the amplifier being designed for audio applications H03F2200/06A balun H03F2200/09A balun H03F2200/102A non-specified detector of a signal envelope being used in an amplifying circuit H03F2200/105A non-specified detector of the power of a signal being used in an amplifying circuit H03F2200/108A coil being added in the drain circuit of a FET amplifier stage H03F2200/111the amplifier being a dual or triple band amplifier H03F2200/114the amplifier comprising means for electro-magnetic interference [EMI] protection H03F2200/117A coil being coupled in a feedback path of an amplifier stage H03F2200/12A bias circuit for some stages being shown using transmission lines H03F2200/121A transistor in common gate configuration being used in a feedback circuit of an amplifier stage H03F2200/123A difference signal between an output and an input signal of an amplifier being coupled back at the input of the amplifier H03F2200/126A diode being coupled in a feedback path of an amplifier stage H03F2200/129there being a feedback over the complete amplifier H03F2200/132Hybrid coupler placed in a feedback circuit of an amplifier H03F2200/135there being a feedback over one or more internal stages in the global amplifier H03F2200/138the feedback circuit comprising a parallel resonance circuit H03F2200/141the feedback circuit of the amplifier stage comprising a resistor and a capacitor in series, at least one of them being an active one H03F2200/144the feedback circuit of the amplifier stage comprising a passive resistor and passive capacitor H03F2200/147the feedback circuit comprising a series resonance circuit H03F2200/15the supply or bias voltage or current at the drain side of a FET being continuously controlled by a controlling signal H03F2200/151A source follower being used in a feedback circuit of an amplifier stage H03F2200/153Feedback used to stabilise the amplifier H03F2200/156One or more switches are realised in the feedback circuit of the amplifier stage H03F2200/159the feedback circuit being closed during a switching time H03F2200/162FETs are biased in the weak inversion region H03F2200/165A filter circuit coupled to the input of an amplifier H03F2200/168Two amplifying stages are coupled by means of a filter circuit H03F2200/171A filter circuit coupled to the output of an amplifier H03F2200/174Floating gate implemented in MOS technology H03F2200/177Folded cascode realised by a folding coil H03F2200/18the bias of the gate of a FET being controlled by a control signal H03F2200/181A coil being added in the gate circuit of a FET amplifier stage H03F2200/183the amplifier comprising a gated diode H03F2200/186the ground, reference potential being controlled H03F2200/189the ground, reference or shield potential difference between different chips being controlled H03F2200/192A hybrid coupler being used at the input of an amplifier circuit H03F2200/195A hybrid coupler being used as power measuring circuit at the input of an amplifier circuit H03F2200/198A hybrid coupler being used as coupling circuit between stages of an amplifier circuit H03F2200/201A hybrid coupler being used as power measuring inter-stage circuit between two stages of an amplifier circuit H03F2200/204A hybrid coupler being used at the output of an amplifier circuit H03F2200/207A hybrid coupler being used as power measuring circuit at the output of an amplifier circuit H03F2200/21Bias resistors are added at the input of an amplifier H03F2200/211the input of an amplifier can be attenuated by a continuously controlled transistor attenuator H03F2200/213A variable capacitor being added in the input circuit H03F2200/216A coil being added in the input circuit H03F2200/219Follower transistors are added at the input of the amplifier H03F2200/222A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier H03F2200/225the input circuit of an amplifying stage comprising an LC-network H03F2200/228A measuring circuit being coupled to the input of an amplifier H03F2200/231the input of an amplifier can be switched on or off by a switch to amplify or not an input signal H03F2200/234the input amplifying stage being one or more operational amplifiers H03F2200/237A parallel resonance being added in series in the input circuit H03F2200/24the supply or bias voltage or current at the source side of a FET being continuously controlled by a controlling signal H03F2200/241A parallel resonance being added in shunt in the input circuit H03F2200/243A series resonance being added in series in the input circuit H03F2200/246A series resonance being added in shunt in the input circuit H03F2200/249A switch coupled in the input circuit of an amplifier being controlled by a circuit H03F2200/252Multiple switches coupled in the input circuit of an amplifier are controlled by a circuit H03F2200/255Amplifier input adaptation especially for transmission line coupling purposes H03F2200/258the input of the amplifier has voltage limiting means H03F2200/261Amplifier which being suitable for instrumentation applications H03F2200/264An operational amplifier based integrator or transistor based integrator being used in an amplifying circuit H03F2200/267A capacitor based passive circuit H03F2200/27A biasing circuit node being switched in an amplifier circuit H03F2200/271the DC-isolation amplifier H03F2200/273the DC-isolation amplifier H03F2200/276the DC-isolation amplifier H03F2200/279the level shifting stage between two amplifying stages being realised by an explicit differential amplifier H03F2200/282the level shifting stage between two amplifying stages being realised by a diode H03F2200/285the level shifting stage between two amplifying stages being realised by an emitter follower H03F2200/288the level shifting stage between two amplifying stages being realised by a resistor or potentiometer H03F2200/291the level shifting stage between two amplifying stages being realised by a source follower H03F2200/294the amplifier being a low noise amplifier [LNA] H03F2200/297the loading circuit of an amplifying stage comprising a capacitor H03F2200/301the loading circuit of an amplifying stage comprising a coil H03F2200/303the loading circuit of an amplifying stage comprising a diode or diode coupled transistor H03F2200/306the loading circuit of an amplifying stage being a parallel resonance circuit H03F2200/309the loading circuit of an amplifying stage being a series resonance circuit H03F2200/31the switching power stage comprising circuitry for emulating the behaviour of a bootstrap diode H03F2200/312the loading circuit of an amplifying stage comprising one or more switches H03F2200/315the loading circuit of an amplifying stage comprising a transmission line H03F2200/318A matching circuit being used as coupling element between two amplifying stages H03F2200/321Use of a microprocessor in an amplifier circuit or its control circuit H03F2200/324An amplitude modulator or demodulator being used in the amplifier circuit H03F2200/327Amplitude shift keying modulation being used in an amplifying circuit H03F2200/33Bridge form coupled amplifiers H-form coupled amplifiers H03F2200/331Sigma delta modulation being used in an amplifying circuit H03F2200/333A frequency modulator or demodulator being used in the amplifier circuit H03F2200/336A I/Q H03F2200/339Pulse amplitude modulation being used in an amplifying circuit H03F2200/342Pulse code modulation being used in an amplifying circuit H03F2200/345Pulse density modulation being used in an amplifying circuit H03F2200/348Pulse frequency modulation being used in an amplifying circuit H03F2200/351Pulse width modulation being used in an amplifying circuit H03F2200/354the amplifier comprising MOS which are biased in the moderate inversion region H03F2200/357the amplifier comprising MOS which are biased in the weak inversion region H03F2200/36the amplifier comprising means for increasing the bandwidth H03F2200/361Transistor with multiple collectors H03F2200/363Transistor with multiple emitters H03F2200/366Multiple MOSFETs are coupled in parallel H03F2200/369A negative impedance circuit being added to an amplifier circuit H03F2200/372Noise reduction and elimination in amplifier H03F2200/375Circuitry to compensate the offset being present in an amplifier H03F2200/378A variable capacitor being added in the output circuit H03F2200/381An active variable resistor H03F2200/384Amplifier without output filter H03F2200/387A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier H03F2200/39Different band amplifiers are coupled in parallel to broadband the whole amplifying circuit H03F2200/391the output circuit of an amplifying stage comprising an LC-network H03F2200/393A measuring circuit being coupled to the output of an amplifier H03F2200/396the output of an amplifier can be switched on or off by a switch to couple the output signal to a load H03F2200/399A parallel resonance being added in shunt in the output circuit H03F2200/402A series resonance being added in shunt in the output circuit H03F2200/405the output amplifying stage of an amplifier comprising more than three power stages H03F2200/408the output amplifying stage of an amplifier comprising three power stages H03F2200/411the output amplifying stage of an amplifier comprising two power stages H03F2200/414A switch being coupled in the output circuit of an amplifier to switch the output on/off H03F2200/417A switch coupled in the output circuit of an amplifier being controlled by a circuit H03F2200/42the input to the amplifier being made by capacitive coupling means H03F2200/421Multiple switches coupled in the output circuit of an amplifier are controlled by a circuit H03F2200/423Amplifier output adaptation especially for transmission line coupling purposes H03F2200/426the amplifier comprising circuitry for protection against overload H03F2200/429Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output H03F2200/432Two or more amplifiers of different type are coupled in parallel at the input or output H03F2200/435A peak detection being used in a signal measuring circuit in a controlling circuit of an amplifier H03F2200/438Separate feedback of amplitude and phase signals being present H03F2200/441Protection of an amplifier being implemented by clamping means H03F2200/444Diode used as protection means in an amplifier H03F2200/447the amplifier being protected to temperature influence H03F2200/45the load of the amplifier being a capacitive element H03F2200/451the amplifier being a radio frequency amplifier H03F2200/453Controlling being realised by adding a replica circuit or by using one among multiple identical circuits as a replica circuit H03F2200/456A scaled replica of a transistor being present in an amplifier H03F2200/459Ripple reduction circuitry being used in an amplifying circuit H03F2200/462the current being sensed H03F2200/465Power sensing H03F2200/468the temperature being sensed H03F2200/471the voltage being sensed H03F2200/474A current mirror being used as sensor H03F2200/477Paralleled transistors are used as sensors H03F2200/48the output of the amplifier being coupled out by a capacitor H03F2200/481A resistor being used as sensor H03F2200/483A shunting switch being paralleled to the sensor H03F2200/486the current in the load of an amplifying stage being sensed by a torus H03F2200/489A coil being added in the source circuit of a common source stage H03F2200/492A coil being added in the source circuit of a transistor amplifier stage as degenerating element H03F2200/495A parallel resonance circuit being added in the source circuit of a FET amplifier H03F2200/498A resistor being added in the source circuit of a transistor amplifier stage as degenerating element H03F2200/501A series resonance circuit being added in the source circuit of a FET amplifier H03F2200/504the supply voltage or current being continuously controlled by a controlling signal H03F2200/507A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit H03F2200/51Capacitor in positive feedback circuit of an amplifier circuit to bootstrap a resistor H03F2200/511Many discrete supply voltages or currents or voltage levels can be chosen by a control signal in an IC-block amplifier circuit H03F2200/513the amplifier being made for low supply voltages H03F2200/516Some amplifier stages of an amplifier use supply voltages of different value H03F2200/519the bias or supply voltage or current of the drain side of a FET amplifier being controlled to be on or off by a switch H03F2200/522the bias or supply voltage or current of the gate side of a FET amplifier being controlled to be on or off by a switch H03F2200/525the bias or supply voltage or current of the source side of a FET amplifier being controlled to be on or off by a switch H03F2200/528the temperature dependence being controlled by referencing to the band gap H03F2200/531the temperature difference between different chips being controlled H03F2200/534Transformer coupled at the input of an amplifier H03F2200/537A transformer being used as coupling element between two amplifying stages H03F2200/54Two or more capacitor coupled amplifier stages in cascade H03F2200/541Transformer coupled at the output of an amplifier H03F2200/543A transmission line being used as coupling element between two amplifying stages H03F2200/546A tunable capacitance being present in an amplifier circuit H03F2200/549the amplifier comprising means to emulate the vacuum tube behaviour H03F2200/552the amplifier being made for video applications H03F2200/555A voltage generating circuit being realised for biasing different circuit elements H03F2200/57Separate feedback of real and complex signals being present H03F2200/61the cascode amplifier has more than one common gate stage H03F2200/63the amplifier being suitable for CATV applications H03F2200/66Clipping circuitry being present in an amplifier H03F2200/69the amplifier stage being a common drain coupled MOSFET H03F2200/72the amplifier stage being a common gate configuration MOSFET H03F2200/75the amplifier stage being a common source configuration MOSFET H03F2200/78A comparator being used in a controlling circuit of an amplifier H03F2200/81Inputs or outputs are crossed during a first switching time, not crossed during a second switching time H03F2200/84A cross coupling circuit being realized by current mirrors H03F2200/87the cross coupling circuit being realised only by MOSFETs H03F2200/91the amplifier has a current mode topology H03F2200/93Two or more transistors are coupled in a Darlington composite transistor configuration, all transistors being of the same type H03F2200/96Two or more complementary transistors are coupled in a Darlington composite transistor configuration H03F2200/99A diode as rectifier being used as a detecting circuit in an amplifying circuit