Oscillator for controlling a mixer stage in a tuner

Details Oscillator for controlling a mixer stage in a tuner Oscillator for controlling a mixer stage in a tuner

1989-12-13

1991-04-02

Pascal, Robert J.

Oscillators

Solid state active element oscillator

Transistors

H03B 500

Patent

active

050049895

ABSTRACT:
In an oscillator (1) comprising a parallel resonant circuit (4), which for fine-tuning the oscillator includes a variable capacitance which is variable in dependence upon a fine-tuning control signal and is constituted by the capacitance occurring in the collector circuit of a transistor. This transistor is a separate transistor (12) whose collector is capacitively coupled to the parallel resonant circuit and which is arranged in common base configuration for alternating current, while its operating point is chosen to be in its saturation range, the fine-tuning control signal being applied to the base-emitter path of this transistor and the transistor base-collector junction, which is in its pass region, being driven further into conduction by this signal within its control range on the one hand, and being driven from its pass region into its cut-off region on the other hand.

REFERENCES:
patent: 4034298 (1977-07-01), McFadyen et al.

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