Phase locked loop frequency synthesizer using digital modulo ari

Details Phase locked loop frequency synthesizer using digital modulo ari Phase locked loop frequency synthesizer using digital modulo ari

1977-09-13

1979-03-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 25, H03B 304

Patent

active

041456670

ABSTRACT:
A reference source of digital pulses of a first frequency f.sub.1 is coupled to the input of a frequency synthesizer which is capable of providing a second frequency f.sub.2 output signal. The second frequency is related to the first frequency by a predetermined, rational fraction (e.g., as f.sub.2 = (M/N)f.sub.1). The synthesizer includes a phase control unit comprising an adder by way of which a first number N is added each sample period to a remainder, the sum output of the adder being operated upon modulo a second number M, e.g., by dividing by M and discarding a resultant quotient to obtain a remainder. The remainder, having a value between zero and M-1, is compared to a prefixed signal, illustratively the largest integer in M/2. If the remainder is less than the prefixed signal, a first logic state control signal is provided to a control system; else a second logic state signal is so provided. The alternation between the first and second logic states is such that M pulses of the second frequency occur for every N pulses of the first frequency. Thereby, the second frequency is synthesized responsive to the first.

REFERENCES:
patent: 3555446 (1971-01-01), Braymer
patent: 3582810 (1971-06-01), Gillette
patent: 4034302 (1977-07-01), May, Jr.
Gillette, "The Digiphase Synthesizer", Frequency Technology, Aug. 1969, pp. 25-29.

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