Phase locked loop system

Details Phase locked loop system Phase locked loop system

1977-04-18

1978-10-31

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 28, 331 36C, 331116R, 331117R, 331177V, H03B 304

Patent

active

041237250

ABSTRACT:
A phase locked loop system is described which controls and locks the frequency of a UHF transmitter to a desired frequency without the need for complex circuitry. A voltage controlled oscillator provides an output signal at the desired frequency and is controlled by an error signal from a phase detector. A harmonic resonator connected to the phase detector is tuned to a frequency which is approximately equal to the desired frequency but is displaced therefrom slightly in frequency. A reference frequency source at a subharmonic of the desired frequency is coupled to the resonator and the output signal is also coupled to the phase detector so as to generate the error signal which locks the voltage controlled oscillation precisely at the desired frequency.

REFERENCES:
patent: 3223942 (1965-12-01), Smenlers
patent: 3323513 (1967-06-01), Gnadke
patent: 3419817 (1968-12-01), Hahnel
patent: 3935541 (1976-01-01), Amend et al.
Blanchard et al., "Get Stable Power by Subharmonic Lock," Microwaves, Jul. 1970, pp. 42-45, 331-347.
Huntoon et al., "Synchronization of Oscillators," Proceedings of the IRE, vol. 35, Dec. 1947, pp. 1415-1423, 331-172.

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