Plural phase locked loop frequency synthesizer

Details Plural phase locked loop frequency synthesizer Plural phase locked loop frequency synthesizer

1982-01-15

1984-07-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 11, 331 14, 331 17, 331 25, 331DIG2, H03L 7118, H03L 7122

Patent

active

044595603

ABSTRACT:
First and second frequency signals are frequency converted by a frequency converter and the frequency-converted output and the output from a variable frequency oscillating means are phase compared by a digital phase comparator. The phase-compared output controls the variable frequency oscillating means, constituting a first phase lock loop of a wide capture range. The output from the variable frequency oscillating means is frequency converted by the first frequency signal and the converted output and the second frequency signal are phase compared by an analog phase comparator. By the phase-compared output is controlled the variable frequency oscillating means, constituting a second phase lock loop of a narrow capture range but a large loop gain. The output frequency of the variable frequency oscillating means is varied by changing the setting of the frequencies of the first and second frequency signals.

REFERENCES:
patent: 4360788 (1982-11-01), Erps et al.
patent: 4388597 (1983-06-01), Bickley et al.
patent: 4409563 (1983-10-01), Vandegraaf

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