Constant high Q voltage controlled oscillator

Details Constant high Q voltage controlled oscillator Constant high Q voltage controlled oscillator

1996-03-06

1997-09-02

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331167, 331183, H03B 508, H03L 500

Patent

active

056636903

ABSTRACT:
A method is described for maintaining a constant Q in a voltage controlled oscillator (VCO) which is tuned over a broad frequency band. A tank circuit (111) sets a center frequency of an oscillator circuit (112). A variable reactance circuit (113) provides a variable effective reactance across the tank circuit (111) corresponding to an applied tuning voltage (117) for tuning the VCO. Resistive currents from the variable reactance circuit are rectified by a rectification circuit (120). A comparator produces a Q control voltage corresponding to the rectified resistive currents and a reference current Iref at a terminal (126) which is coupled to a variable resistance circuit (122) for supplying differential resistive currents to the tank circuit (111) which offset the resistive currents from the variable reactance circuit, thereby maintaining a constant Q in the VCO.

REFERENCES:
patent: 3835418 (1974-09-01), Gilbert
patent: 3965441 (1976-06-01), Roy et al.
patent: 4638265 (1987-01-01), Lunn et al.
patent: 5117205 (1992-05-01), Nauta

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