Electronic phase locked loop circuit

Details Electronic phase locked loop circuit Electronic phase locked loop circuit

1978-05-08

1980-02-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

307232, 307261, 328151, 331 27, H03B 304

Patent

active

041874730

ABSTRACT:
An electronic phase locked loop circuit including a variable period sawtooth generator. The sawtooth generator receives digital reference clock signals and in response thereto generates sawtooth-shaped signals having the same period as said reference clock signals. A sample and hold circuit samples the sawtooth-shaped signals in response to one logical state of a sampling clock. A voltage controlled oscillator is coupled to the output of the sample and hold circuit and oscillates at a frequency proportional to the magnitude of the held sample. A feedback circuit generates the sampling clock by coupling the output of the voltage controlled oscillator to the sampling input of the sample and hold circuit.

REFERENCES:
patent: 4078213 (1978-03-01), Campioni
COS/MOS Phase Comparator, R. Feryszka et al., 1973 IEEE Intern. Solid-State Circuit Confer., pp. 184, 185, 222, 223, Feb. 14-16, 1973.

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