VCO feedback loop to reduce phase noise

Details VCO feedback loop to reduce phase noise VCO feedback loop to reduce phase noise

2006-02-07

2006-02-07

Shingleton, Michael B (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C327S101000, C327S311000, C331S00100A, C331S017000, C331S034000, C331S057000, C331S048000, C331S17700V, C331S17700V

Reexamination Certificate

active

06995618

ABSTRACT:
A phase adjustment module in a voltage controlled oscillator (VCO) samples a VCO oscillation to detect changes in the oscillation frequency and produces a corresponding correction voltage that is feedback to the VCO input to correct the frequency change. A plurality of sampling modules, each formed to start sampling at a different point on the oscillation cycle, charge a sampling module capacitor over the period of a full oscillation cycle. The samples are coupled to a low pass filter to produce a running average of all the samples. The charge on each capacitor is coupled to a first input of a plurality of operational amplifiers and the running average is coupled to a second input. The summed output of the operational amplifiers is substantially equal to a difference between the running average and a voltage representing the instantaneous time change or phase change of the oscillation frequency.

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U.S. Appl. No. 10/660,062, filed Sep. 11, 2003, Groen et al.
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U.S. Appl. No. 10/659,803, filed Sep. 11, 2003, Black et al.
U.S. Appl. No. 10/659,971, filed Sep. 11, 2003, Boecker et al.

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