Phase-locked loop transceiver having automatic frequency offset

Details Phase-locked loop transceiver having automatic frequency offset Phase-locked loop transceiver having automatic frequency offset

1974-08-05

1976-03-16

Mayer, Albert J.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325 20, 325420, 329126, 329136, 331 1A, 331 34, H04B 140

Patent

active

039449254

ABSTRACT:
This specification discloses a frequency synthesizer or phase-locked loop transceiver operating from a reference oscillator source, F.sub.REF. A single phase-locked loop system for the transceiver includes counter means located in a feedback path connected between a voltage controlled oscillator (VCO) and a digital phase detector. The counter is preset to a predetermined number N for generating a frequency representation ##EQU1## The counter means includes logic and decoding circuitry for automatically modifying the ##EQU2## signal representation by a factor M for generating a feedback signal F.sub.F, where F.sub.F is ##EQU3## The feedback signal representation ##EQU4## is applied to the digital phase detector for generating a transmit or receive signal .sup.F OUT, where .sup.F OUT = .sup.F REF .sup.(N .+-. M).

REFERENCES:
patent: 3551826 (1970-12-01), Sepe
patent: 3641434 (1972-02-01), Yates
patent: 3801925 (1974-04-01), Parkyn
patent: 3803495 (1974-04-01), Reynolds

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