Phase lock loop PSK demodulator with sweep control circuit

Details Phase lock loop PSK demodulator with sweep control circuit Phase lock loop PSK demodulator with sweep control circuit

1985-01-24

1985-10-15

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 331 4, 331 23, 331 25, 331DIG2, 375 81, 375120, H04L 2722, H03L 712

Patent

active

045477361

ABSTRACT:
The present invention discloses a phase lock loop circuit which recovers a carrier for demodulating a PSK signal wherein a sweep signal is suspended when a decision signal indicates the phase-locked state. The level of the sweep signal is held and applied to the phase lock loop at the time the circuit becomes phase-locked, thereby an unwanted sweep signal component is no longer generated when the sweep stops. Thus stable phase-locked operation can be realized.

REFERENCES:
patent: 4000476 (1976-12-01), Walker et al.
patent: 4077016 (1978-02-01), Sauders et al.
patent: 4092606 (1978-05-01), Ryan
patent: 4121166 (1978-10-01), Matsumoto et al.

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