Frequency and phase comparator

Details Frequency and phase comparator Frequency and phase comparator

1995-07-28

1997-05-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 44, 327 49, 327161, H03D 1300, G01R 2500

Patent

active

056315821

ABSTRACT:
A frequency and phase comparator has a first flip-flop and a second flip-flop. Logical calculation between the outputs of these flip-flops is performed by an AND circuit, and the first and second flip-flops are reset by the output of the logical calculation. The first and second flip-flops receive periodic signals at their clock terminals. When the periods of the output pulses of the first and second flip-flops are short, a circuit driven by the pulses sometimes cannot operate correctly. To prevent this, a pulse generating circuit is provided which receives a first periodic signal and a second periodic signal to generate a pulse signal of a predetermined width, and the pulse signal is added to the outputs of the first and second flip-flops.

REFERENCES:
patent: 4378509 (1983-05-01), Hatchett et al.
patent: 4484142 (1984-11-01), Rub et al.
patent: 4894565 (1990-01-01), Marquardt
patent: 4904948 (1990-02-01), Asami
patent: 4970475 (1990-11-01), Gillig
patent: 5095287 (1992-03-01), Irwin et al.
patent: 5142555 (1992-08-01), Whiteside
patent: 5266851 (1993-11-01), Nukui
patent: 5302916 (1994-04-01), Pritchett

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