Frequency synthesizer for transmitter/receiver using a phase loc

Details Frequency synthesizer for transmitter/receiver using a phase loc Frequency synthesizer for transmitter/receiver using a phase loc

1978-09-01

1979-05-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

325 20, 325 25, 331 25, H03B 304

Patent

active

041538846

ABSTRACT:
A frequency synthesizer for use in a transmitter/receiver, comprising a voltage controlled oscillator, a programmable frequency divider for dividing the frequency of the output from the voltage controlled oscillator, a reference oscillator, a reference counter for dividing the frequency of the output from the reference oscillator, a phase detector for phase detecting the frequencies of the reference counter and the frequency divider for providing a control voltage to said voltage controlled oscillator, a transmitting/receiving mode selection circuit for selectively controlling the programmable frequency divider such that the frequency division rate thereof is different in the transmitting and receiving modes, a channel designating circuit, a first output terminal for withdrawing an output by mixing the output from the voltage controlled oscillator with the output from the reference oscillator, and a second output terminal for directly withdrawing the output from the voltage controlled oscillator, said transmitting/receiving mode selection circuit comprising a transmitter/receiver selection switch, and full adder means or a read only memory for storing in advance information concerning the frequency division rate of the frequency divider based on the output from the transmitter/receiver selection switch and the output from the channel designating circuit.

REFERENCES:
patent: 3854102 (1974-12-01), Seipel et al.
patent: 3944925 (1976-03-01), DeLaune
patent: 3983484 (1976-09-01), Hodama
patent: 4002995 (1977-01-01), Reed

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