Frequency synthesizer with improved automatic control of loop ba

Details Frequency synthesizer with improved automatic control of loop ba Frequency synthesizer with improved automatic control of loop ba

1989-05-01

1990-05-15

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 1A, 331 17, 331 25, 455260, H03L 7085, H03L 7107, H03L 718

Patent

active

049261410

ABSTRACT:
A method of and apparatus for automatically selecting one of first and second loop bandwidth states of a phase lock loop circuit of a frequency synthesizer. The phase lock loop circuit is governed by a reference frequency signal and a feedback frequency signal to adjust the frequency of the synthesized frequency signal to a frequency channel setting. Each of the reference and feedback frequency signals include one phase indication per frequency period. The feedback frequency signal is phase and frequency representative of the synthesized frequency signal. The loop bandwidth of the phase lock loop circuit is automatically switched from the first to the second state based on an initial occurrence of three successive phase indications of a selected one of the reference and feedback frequency signals between successive phase indications of the other, and automatically switched back from the second to the first state based on an initial occurrence of two successive phase indications of the other frequency signal between successive phase indications of the selected frequency signal.

REFERENCES:
patent: 4167711 (1979-09-01), Smoot
patent: 4516083 (1985-05-01), Turney
patent: 4745372 (1988-05-01), Miwa
patent: 4771249 (1988-09-01), Burch et al.
Specification for NJ88C31, Plessey Co., Pfc, Publication No. PS 2059, May 1986.

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