Wideband FM modulator and AFC control loop therefor

Details Wideband FM modulator and AFC control loop therefor Wideband FM modulator and AFC control loop therefor

1980-12-18

1983-06-07

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 328134, 331 18, 331 23, 455 75, 455119, H03C 300, H03L 706

Patent

active

043873510

ABSTRACT:
An AFC loop for controlling the frequency of a VCO including an A to D converter and divider for providing pulses at some frequency equal to or lower than the output of the VCO, a source of stable reference pulses and a counter constructed to count to a predetermined number and count the reference pulses in synchronism with the divided pulses, a second divider connected to divide the reference pulses by the predetermined number and means for subtracting the output of the second divider from the counter to provide a control voltage for the VCO which is proportional to the drift in frequency of the VCO from a mean frequency.

REFERENCES:
patent: 4006429 (1977-02-01), Talbot
patent: 4128811 (1978-12-01), Englund, Jr.
patent: 4286237 (1981-08-01), James

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