Digital phase comparator with improved sensitivity for small pha

Details Digital phase comparator with improved sensitivity for small pha Digital phase comparator with improved sensitivity for small pha

1980-04-28

1982-03-30

Smith, Alfred E.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328133, H03D 1300

Patent

active

043226434

ABSTRACT:
A digital phase comparator for essentially eliminating the dead zone in the phase correction means of a phase locked loop. The digital phase comparator is arranged to provide respective up and down output pulses to operate respective charge pumps. The up and down output pulses at all times are greater than a predetermined time duration no matter how small the phase difference between comparator input signals. A delay means is provided in the phase comparator logic, which delay means substantially determines such predetermined time duration. The minimum pulse duration of the up and down signals is selected to be at least of a duration sufficient to operate its respective charge pump, thereby overcoming the finite turn on time of the respective charge pump, no matter how small the phase error.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 3710140 (1973-01-01), Volmerange
patent: 3714463 (1973-01-01), Laune
patent: 4023116 (1977-05-01), Alfke et al.
patent: 4122405 (1978-10-01), Tietz et al.
patent: 4278903 (1981-07-01), Ichinose
"A New Design Technique for Digital PLL Synthesizers", by Eric Breeze, Published in IEEE Transactions on Consumer Electronics, vol. CE-24, No. 1, Feb. 1978.
"Test Your Charge Pump Phase Detectors", by William Egan, Published in Electronic Design, Jun. 7, 1978.
Technical Information on Integrated Circuit Types 11C00 Series, Published by Fairchild Semiconductor Group, Fairchild Camera and Instrument Corporation, 1978.
Integrated Circuit Application Note ICAN-6101, Published by RCA Corporation, 1978.

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