Fast lock PLL having out of lock detector control of loop filter

Details Fast lock PLL having out of lock detector control of loop filter Fast lock PLL having out of lock detector control of loop filter

1982-05-14

1985-05-07

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 4, 331 16, 331 17, 331 25, 331DIG2, 455260, H03L 710, H03L 718

Patent

active

045160830

ABSTRACT:
A phase-locked loop comprises a reference source that produces a signal at a fixed frequency that is applied to a phase detector. That signal is compared in the phase detector with a divided quotient signal that is proportional to the output of a voltage-controlled oscillator. Comparison of the phase difference between the two signals creates an output voltage that is taken to an adaptive filter. The adaptive filter is controlled by an external logic circuit that selects a narrow bandwidth when phase lock is detected and a wider bandwidth when the absence of phase lock is detected. The divisor of the divider in the loop is also changed in response to a signal based on the phase difference. The output of the adaptive filter is taken to a summer which adds a modulating signal to form a combined controlled voltage for the VCO.

REFERENCES:
patent: 3164777 (1965-01-01), Guanella
patent: 3729688 (1973-04-01), Cerny, Jr. et al.
patent: 4135165 (1979-01-01), Coe
patent: 4188582 (1980-02-01), Cannalte et al.
patent: 4290029 (1981-09-01), Streckenbach
patent: 4330758 (1982-05-01), Swisher et al.
patent: 4388598 (1983-06-01), Egan

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