Microprocessor-controlled frequency synthesizer

Details Microprocessor-controlled frequency synthesizer Microprocessor-controlled frequency synthesizer

1980-02-21

1982-03-30

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 10, 331 16, 331 19, 331 25, 332 19, H03L 718, H03L 720, H03L 722

Patent

active

043226922

ABSTRACT:
A microprocessor-controlled synthesizer has a low frequency section producing a first output frequency and a comb loop producing a second output frequency. The comb loop includes a multiplier which produces harmonics of 100 MHz one of which is selected and fed to a mixer in a phase-locked loop having a variable divider, the other input of the mixer being a VCO output frequency. At low values of the second output frequency, the phase detector locks to the difference output from the mixer, at higher values to the sum output. The output from the mixer is mixed in a second mixer with the output of a further VCO, and a second phase detector selects the sum output from the second mixer to cover the first half of each decade of MHz and selects the difference output to cover the second half of the decade.

REFERENCES:
patent: 4086545 (1978-04-01), Teshirogi
patent: 4095190 (1978-06-01), Imazeki et al.
patent: 4097816 (1978-06-01), Imazeki et al.
patent: 4246547 (1981-01-01), Gerard et al.

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