Programmable divider

Details Programmable divider Programmable divider

1977-12-16

1979-07-24

Safourek, Benedict V.

Oscillators

Relaxation oscillators

325421, 331 1A, H04B 126

Patent

active

041624505

ABSTRACT:
An improved programmable divider employed in a frequency synthesizer which is part of an FM broadcast receiver. The programmable divider has a counter and counter control circuitry for dividing-down the output of a voltage controlled oscillator to the output of a reference frequency source. The counter control circuit causes the counter to count through a first fixed phase after which a second variable count phase takes place. The duration of the second phase is established by an analog input timing circuit and varies with the tuned frequency. After the second phase, the counter counts through a third fixed phase which is a function of the offset or intermediate frequency of the receiver.

REFERENCES:
patent: 3504484 (1970-04-01), Basse
patent: 3988696 (1976-10-01), Sharpe

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