Amplitude limited varactor tuned L-C oscillator

Details Amplitude limited varactor tuned L-C oscillator Amplitude limited varactor tuned L-C oscillator

1979-09-19

1981-09-01

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177V, H03B 512

Patent

active

042874890

ABSTRACT:
An electronically tunable oscillator comprises a transistor coupled to ground by an emitter resistor. The collector and base of the transistor are interconnected through an inductor which has a tap connected to a bypass capacitor and a B+ voltage source. The source maintains the collector and base at the same DC potential. The collector of the transistor is coupled to a capacitance which cooperates with the inductor to provide a tuned circuit. At least part of the capacitance is provided by a varactor whose value can be controlled to determine oscillator frequency. The magnitude of the oscillator frequency is limited to two times the base to emitter voltage of the transistor and the use of the emitter resistor cooperates to minimize distortion.

REFERENCES:
patent: 3407363 (1968-10-01), Kaiser et al.
patent: 3541450 (1970-11-01), Paine et al.
patent: 3894229 (1975-07-01), Mouri
patent: 4009454 (1977-02-01), Darrow

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