Voltage-controlled oscillator with control range limiter

Details Voltage-controlled oscillator with control range limiter Voltage-controlled oscillator with control range limiter

2008-04-30

2010-06-01

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S167000, C331S1170FE, C331S17700V

Reexamination Certificate

active

07728676

ABSTRACT:
A voltage-controlled oscillator (VCO) comprising a first circuit, a second circuit, a comparator circuit, and a control unit. The first circuit can determine an output common mode voltage associated with an output of the VCO. The second circuit can generate an upper control voltage limit and a lower control voltage limit associated with a control voltage received by the VCO based, at least in part, on the output common mode voltage. The comparator circuit can compare the control voltage to the upper and lower control voltage limits. The control unit can determine whether to change a switched capacitance associated with the VCO based, at least in part, on whether the control voltage is outside the upper and lower control voltage limits, thereby maintaining an optimal region of operation for the control voltage.

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“U.S. Appl. No. 12/120,827 Office Action”, Oct. 9, 2009 , 10 pages.

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