Frequency synthesizer with dynamically programmable frequency ra

Details Frequency synthesizer with dynamically programmable frequency ra Frequency synthesizer with dynamically programmable frequency ra

1989-05-01

1990-02-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 2, 331 8, 331 14, 331 17, H03L 710, H03L 718

Patent

active

049010336

ABSTRACT:
A frequency synthesizer which includes at least one phase lock loop operative in a selected loop bandwidth state includes a dynamically programmable control circuit for setting the frequency range of its selected loop bandwidth state. In another aspect, the frequency synthesizer may include a plurality of phase lock loop circuits; and a common bias circuit programmably operative to generate at least one bias signal which is coupled commonly to the plurality of phase lock loop circuits for setting a common frequency range for the loop bandwidth states of all of the phase lock loop circuits. In still another aspect, the frequency synthesizer includes a phase lock loop circuit; and a bias circuit programmably operative to generate at least one bias signal which is coupled to the phase lock loop circuit for setting a reference frequency range of the loop bandwidth states thereof, the phase lock loop circuit being dynamically programmable to vary the frequency range settings of the loop bandwidth states in relation to the reference frequency range set by the bias circuit.

REFERENCES:
patent: 4167711 (1979-09-01), Smoot
patent: 4659999 (1987-04-01), Motoyama et al.
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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