Automatic gain control for tank type voltage controlled oscillat

Details Automatic gain control for tank type voltage controlled oscillat Automatic gain control for tank type voltage controlled oscillat

1987-05-12

1988-08-09

Wan, Gene

Oscillators

Solid state active element oscillator

Transistors

331117R, 331177V, 331183, H03B 508, H03L 500

Patent

active

047630868

ABSTRACT:
A voltage controlled oscillator circuit of a type having a tank circuit for generating oscillations which includes a means for establishing a fixed bias voltage with respect to ground at a bias end of said tank circuit, means for drawing current from an a.c. end of said tank so as to control the tank gain, and an AGC capacitor. A constant current source is coupled to the AGC capacitor for supplying it with a constant charging current. Means are provided for discharging the AGC capacitor at a voltage level determined by a ratio of resistors and a transistor emitter-base ratio.

REFERENCES:
patent: 4608544 (1986-08-01), Nordholt et al.

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