Automatic phase and frequency control system

Details Automatic phase and frequency control system Automatic phase and frequency control system

H - Electricity

03

B

331/34

H03B 5/00 (2006.01) H03B 19/00 (2006.01) H03B 21/00 (2006.01) H03L 7/087 (2006.01) H03L 7/16 (2006.01)

Patent

CA 1080816

ABSTRACT OF THE DISCLOSURE An automatic phase and frequency control system includes a pair of multipliers coupled to a source of input signal. A vol- tage controlled oscillator is also coupled to each of the multi- pliers. Means are provided to phase shift the oscillator signal at one multiplier such that quadrature beat signals are produced. The output of one of the multipliers is coupled directly to a third multiplier while the output of the other is coupled to a low pass filter. The filtered signal is amplitude limited and applied to the third multiplier. A second low pass filter couples the output of the third multiplier to the frequency control input of the vol- tage controlled oscillator. -2-

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