Circuit for driving a voltage controlled oscillator for...

Details Circuit for driving a voltage controlled oscillator for... Circuit for driving a voltage controlled oscillator for...

2006-02-21

2006-02-21

Tra, Quan (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S034000, C331S175000

Reexamination Certificate

active

07002416

ABSTRACT:
A circuit provides an output signal for modulating the oscillation frequency of a voltage-controlled oscillator (VCO) in response to a control signal where the VCO includes a first voltage-controlled variable capacitance device for varying the oscillation frequency of the VCO according to the output signal. The circuit includes a charge pump providing a charge current to a first node, a first capacitor having a fixed capacitance and a second capacitor both coupled to the first node, and an amplifier providing the output signal. The second capacitor includes a second voltage-controlled variable capacitance device having the same device structure as the first voltage-controlled variable capacitance device of the VCO. In operation, a voltage change at the first node is generated in response to the charge current and the output signal causes the same voltage change to be applied across the first voltage-controlled variable capacitance device of the VCO.

REFERENCES:
patent: 5977806 (1999-11-01), Kikuchi
patent: 5982836 (1999-11-01), Sakae et al.
patent: 2002/0017958 (2002-02-01), Van Zeijl

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