Citizens band transceiver frequency synthesizer with single offs

Details Citizens band transceiver frequency synthesizer with single offs Citizens band transceiver frequency synthesizer with single offs

1979-05-07

1981-02-03

Moore, David K.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

455 76, 455165, 331 18, H03B 304

Patent

active

042491380

ABSTRACT:
A frequency synthesizer for a citizens band transceiver is disclosed. The synthesizer utilizes a single master crystal oscillator whose output is coupled to a difference mixer that receives the output of a voltage controlled oscillator (VCO) and provides an input to a programmable frequency divider. This programmable divider provides an output to a phase-frequency comparator which commpares this signal to a reference signal supplied by a fixed divider coupled to the master crystal oscillator. The comparator output, through a low pass filter, controls the voltage controlled oscillator output. The VCO output signal is substantially higher than the maximum frequency capability of the programmable frequency divider, and the present invention by utilizing the master crystal oscillator and difference mixer provides an inexpensive frequency synthesizer utilizing a programmable frequency divider having relatively low maximum input frequency capabilities, and this accomplished without the use of costly multiplier circuits in the frequency synthesizer.

REFERENCES:
patent: 4061973 (1977-12-01), Reiners et al.
patent: 4078212 (1978-03-01), Rast
patent: 4135158 (1979-01-01), Parmet

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