Generation of oscillations using amplifier with regenerative feedback from output to input

HELECTRICITY H03Electronic circuits H03BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER GENERATION OF NOISE BY SUCH CIRCUITS

H03B5/00Generation of oscillations using amplifier with regenerative feedback from output to input

H03B5/02Details H03B5/04Modifications of generator to compensate for variations in physical values H03B5/06Modifications of generator to ensure starting of oscillations H03B5/08with frequency-determining element comprising lumped inductance and capacitance H03B5/10active element in amplifier being vacuum tube H03B5/12active element in amplifier being semiconductor device H03B5/1203the amplifier being a single transistor H03B5/1206using multiple transistors for amplification H03B5/1209the amplifier having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths H03B5/1212the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other H03B5/1215the current source or degeneration circuit being in common to both transistors of the pair H03B5/1218the generator being of the balanced type H03B5/1221the amplifier comprising multiple amplification stages connected in cascade H03B5/1225the generator comprising multiple amplifiers connected in parallel H03B5/1228the amplifier comprising one or more field effect transistors H03B5/1231the amplifier comprising one or more bipolar transistors H03B5/1234and comprising means for varying the output amplitude of the generator H03B5/1237comprising means for varying the frequency of the generator H03B5/124the means comprising a voltage dependent capacitance H03B5/1243the means comprising voltage variable capacitance diodes H03B5/1246the means comprising transistors used to provide a variable capacitance H03B5/125the transistors being bipolar transistors H03B5/1253the transistors being field-effect transistors H03B5/1256the means comprising a variable inductance H03B5/1259the means comprising a variable active inductor H03B5/1262the means comprising switched elements H03B5/1265switched capacitors H03B5/1268switched inductors H03B5/1271the frequency being controlled by a control current H03B5/1275having further means for varying a parameter in dependence on the frequency H03B5/1278the parameter being an amplitude of a signal H03B5/1281the parameter being the amount of feedback H03B5/1284the parameter being another frequency H03B5/1287the parameter being a quality factor H03B5/129the parameter being a bias voltage or a power supply H03B5/1293having means for achieving a desired tuning characteristic H03B5/1296the feedback circuit comprising a transformer H03B5/14frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted H03B5/16active element in amplifier being vacuum tube H03B5/18with frequency-determining element comprising distributed inductance and capacitance H03B5/1805the frequency-determining element being a coaxial resonator H03B5/1811the active element in the amplifier being a vacuum tube H03B5/1817the frequency-determining element being a cavity resonator H03B5/1823the active element in the amplifier being a semiconductor device H03B5/1829the semiconductor device being a field-effect device H03B5/1835the active element in the amplifier being a vacuum tube H03B5/1841the frequency-determining element being a strip line resonator H03B5/1847the active element in the amplifier being a semiconductor device H03B5/1852the semiconductor device being a field-effect device H03B5/1858the active element in the amplifier being a vacuum tube H03B5/1864the frequency-determining element being a dielectric resonator H03B5/187the active element in the amplifier being a semiconductor device H03B5/1876the semiconductor device being a field-effect device H03B5/1882the frequency-determining element being a magnetic-field sensitive resonator H03B5/1888the active element in the amplifier being a semiconductor device H03B5/1894the semiconductor device being a field-effect device H03B5/20with frequency-determining element comprising resistance and either capacitance or inductance H03B5/22active element in amplifier being vacuum tube H03B5/24active element in amplifier being semiconductor device H03B5/26frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted frequency-determining element being connected via a bridge circuit to such a closed ring H03B5/28active element in amplifier being vacuum tube H03B5/30with frequency-determining element being electromechanical resonator H03B5/32being a piezo-electric resonator H03B5/323the resonator having more than two terminals H03B5/326the resonator being an acoustic wave device H03B5/34active element in amplifier being vacuum tube H03B5/36active element in amplifier being semiconductor device H03B5/362the amplifier being a single transistor H03B5/364the amplifier comprising field effect transistors H03B5/366and comprising means for varying the frequency by a variable voltage or current H03B5/368the means being voltage variable capacitance diodes H03B5/38frequency-determining element being connected via bridge circuit to closed ring around which signal is transmitted H03B5/40being a magnetostrictive resonator H03B5/42frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted