Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1981-01-09
1983-12-27
Grimm, Siegried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331 11, 331 14, 331DIG2, H03L 712
Patent
active
044233906
ABSTRACT:
A sidelock avoidance scheme for preventing sidelock in a PSK demodulator's carrier recovery loop contains augmenting sweep control circuitry, including a frequency discriminator and an associated window comparator. The output of the frequency discriminator, which is low pass filtered to remove noise, is applied to the window comparator which compares any differential between the true carrier and the output of a carrier recovery loop to a preset reference threshold representative of a frequency error condition that may approach sidelock. When the output of the frequency discriminator is greater that this preset reference threshold, an augmented frequency control voltage is applied to the voltage control oscillator of the loop to drive the oscillator away from a possible sidelock condition and toward the true carrier. The augmented frequency control voltage may be derived from a frequency sweep generator or from the output of the frequency discriminator, depending upon a selected strapping option.
REFERENCES:
patent: 3768030 (1973-10-01), Brown et al.
patent: 3796962 (1974-03-01), Hekimian
patent: 4000476 (1976-12-01), Walker et al.
patent: 4077016 (1978-02-01), Sanders et al.
Grimm Siegried H.
Harris Corporation
Wiens Tim A.
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