Plural feedback loop digital frequency synthesizer

Details Plural feedback loop digital frequency synthesizer Plural feedback loop digital frequency synthesizer

1989-04-17

1990-03-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 25, 331 31, H03L 718, H03L 722

Patent

active

049124323

ABSTRACT:
A multiple feedback loop frequency synthesizer, having a first and a second feedback loop, each fed by one of a pair of reference frequency signals having a frequency separation equal to the desired frequency separation of the output signals provided by the synthesizer. The frequency of each of such reference frequency signals is greater than the desired frequency separation of the output signals provided by the synthesizer. With such arrangement, because the bandwidth of each of the feedback loops must be less than the frequency of the reference frequency signal fed to such loop, achievement of frequency separation less than the frequency of either one of the reference frequencies enables each of the feedback loops to have increased bandwidth and hence reduced frequency switching times and increased noise suppression.

REFERENCES:
patent: 3600699 (1971-08-01), Orenberg
Motorola Spec. Sheet for MC12040/MC12540, pp. 6-81 to 6-84.

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