PLL having phase comparator with hysteresis characteristics

Details PLL having phase comparator with hysteresis characteristics PLL having phase comparator with hysteresis characteristics

1985-06-28

1986-09-16

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, H03L 706

Patent

active

046125159

ABSTRACT:
A phase synchronization circuit of a phase lock loop having a phase comparator, a loop filter or a low-pass filter and a voltage controlled oscillator controlled by output of said loop filter has been improved by a phase comparator having the hysterisis characteristics in which one of a pair of output levels is provided for each input phase difference according to phase error direction, except in the vicinity of a stable point of phase.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 4277754 (1981-07-01), Minakuchi
patent: 4470018 (1984-09-01), Steinlin
"Analysis of Carrier Recovery Circuit for Coherent Detection of TDMA Signal", Takuro Muratani et al., Transaction of Institute of Electronics and Communication Engineers of Japan, Apr. 1971, vol. 54-B, No. 4, pp. 160-167.

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