Voltage controlled oscillator with anti supply voltage...

Details Voltage controlled oscillator with anti supply voltage... Voltage controlled oscillator with anti supply voltage...

2005-07-19

2008-11-11

Chang, Joseph (Department: 2817)

Oscillators

Amplitude control or stabilization

C331S185000

Reexamination Certificate

active

07449972

ABSTRACT:
A voltage controlled oscillator with anti supply voltage variation and/or process variation includes an oscillation circuit for outputting an oscillatory signal; a current source coupled to the oscillation circuit for providing an input current to the oscillation circuit; and a variation compensation circuit for compensating the variations generated by the supply voltage and process. The variation compensation circuit includes a peak detector for generating a peak voltage proportional to the amplitude of the oscillatory signal; a compensating voltage generator for generating a reference voltage according to the process variation so that the oscillation circuit achieves the same working conditions under the process variation; and a comparator for comparing the peak voltage and the reference voltage to generate a control voltage. When the variation compensation circuit includes an amplifier, the supply voltage can be compensated.

REFERENCES:
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patent: 6278338 (2001-08-01), Jansson
patent: 6653908 (2003-11-01), Jones
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patent: 2003/0025566 (2003-02-01), Rogers
patent: 2006/0152295 (2006-07-01), Miyashita et al.

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