Phase detector circuit

Details Phase detector circuit Phase detector circuit

1991-12-20

1993-12-14

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375120, 329307, 307511, H03D 318

Patent

active

052710408

ABSTRACT:
A digital phase detector circuit is designed for particular application with a phase-locked loop voltage controlled oscillator system for synchronizing the MFM synchronization pulses on a floppy disk with the operation of the computer in which the disk is used. A classical Type 4 digital phase detector is employed, to which a bistable latch is added. The latch is set upon coincidence of reference and data pulses applied to the phase detector within a pre-established time interval or window. The output of the phase detector then is utilized only when the output of the latch indicates such coincidence; so that erroneous control signals are not supplied through the loop whenever data pulses fail to occur in adjacent time frames or windows.

REFERENCES:
patent: 4584695 (1986-04-01), Wong et al.
patent: 4617679 (1986-10-01), Brooks
patent: 4837781 (1989-06-01), Hickling
patent: 4972161 (1990-11-01), Davis et al.
patent: 5003562 (1991-03-01), Van Drieck et al.
patent: 5097489 (1992-03-01), Tucci
R. E. Best, Phase-Locked Loops, McGraw-Hill, Inc., New York, 1984, pp. 9-15 and 70-79.

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