Wide range digital phase/frequency detector

Details Wide range digital phase/frequency detector Wide range digital phase/frequency detector

1987-08-17

1989-06-27

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307511, 307526, 328109, 328134, H03K 513, H03K 522

Patent

active

048433322

ABSTRACT:
A digital phase/frequency detector circuit in a phase locked loop comprises a logic gate interconnected with a pair of bistable devices clocked respectively by input and reference digital signals to generate a square wave having a duty ratio corresponding to the phase/frequency difference between the two signals. The duty ratio of the square wave sweeps repetitively between minimum and maximum values as the phase/frequency difference changes monotonically. The square wave is integrated to obtain a repetitive sawtooth. To increase the range, circuitry is provided to provide a constant level signal when the peak of a sawtooth is approached and to reset the bistable devices to provide a multiple of the earlier range.

REFERENCES:
patent: 4267514 (1981-05-01), Kimsey
patent: 4277754 (1981-07-01), Minakuchi
patent: 4333055 (1982-06-01), Crackel
patent: 4599570 (1986-09-01), Cloke

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