Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1988-12-02
1989-10-24
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 11, 331 25, H03L 700
Patent
active
048765180
ABSTRACT:
A system for automatically tracking and locking to an applied scanning input signal the frequency of which may vary over a range of frequencies includes a PLL comprising a VCO and phase detector as well as a digital frequency counting section which forms a closed loop with the VCO. The VCO is operated preferably at 32 times the frequency of the applied input signal and provides a clock signal to the digital section which also receives the input signal. The digital section includes a counter and decoder-latch wherein the clock signal that is supplied to the counter is used to measure the frequency of the applied input signal. Counting and decoding result on alternating periods of the applied input signal such that the decoder-latch decides if the count is too low, too high or within the range of the PLL and controls the operating frequency of the VCO to find and maintain phase lock.
REFERENCES:
patent: 4258333 (1981-03-01), Demuliere et al.
patent: 4272729 (1981-06-01), Riley, Jr.
LaRoche Eugene R.
Motorola Inc.
Pascal Robert J.
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