Digital phase locked loop tuning system

Details Digital phase locked loop tuning system Digital phase locked loop tuning system

1976-06-14

1978-10-17

Griffin, Robert L.

Oscillators

Relaxation oscillators

325457, 325459, 325468, 331 1A, H04B 116

Patent

active

041211626

ABSTRACT:
A phase locked loop circuit for use in an automatic frequency synthesizing system. The system includes a programmer circuit which is responsive to a channel number input signal and generates a first digital control signal which is representative of the selected channel number and a second digital control signal which is representative of a predetermined group of channel numbers. A programmable divider is controlled by the programming circuit and generates a digital output signal which causes the phase locked loop circuit to generate a desired system output frequency corresponding to the selected channel number input signal. The phase locked loop circuit includes automatic fine tuning and manual fine tuning features.

REFERENCES:
patent: 3883807 (1975-05-01), Alberkrack
patent: 3956702 (1976-05-01), Tanaka
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4009439 (1977-02-01), Rast
patent: 4024476 (1977-05-01), Briggs
"A Frequency Synthesizer for Television Receivers" by Breeze et al., Transactions BTR, 11/1974.
IEEE Transaction on Consumer Electronics, "Simplified TV Tuning System" by Hilliker, 2-1976.

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