Programmable voltage-controlled oscillator having control curren

Details Programmable voltage-controlled oscillator having control curren Programmable voltage-controlled oscillator having control curren

1993-09-30

1995-03-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 34, 331113R, 331143, 331177R, 331DIG3, H03K 303, H03L 100, H03L 7099

Patent

active

053999940

ABSTRACT:
A programmable VCO circuit (300, 700) and method of use are provided whereby a current proportional to the strength of the NMOS process used to fabricate the circuit may be subtracted from the control current derived at the circuit's input, to compensate for process variations. Also, a programmable VCO circuit (300) and method of use are provided whereby a current developed from one-half the supply voltage for the VCO circuit may be subtracted from the control current derived at the circuit's input, in order to cause programmed gain changes to occur about the center of the control voltage range, and minimize output "jitter" when the VCO is used in a phase-locked loop. A gain compensation circuit (800) is also provided to linearize the gain of the programmable VCO circuit (300) for higher control voltage levels and thereby extend the VCO's effective operating range.

REFERENCES:
patent: 5144156 (1992-09-01), Kawasaki
patent: 5302919 (1994-04-01), Abe

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