Method for shaping a pulse width and circuit therefor

Details Method for shaping a pulse width and circuit therefor Method for shaping a pulse width and circuit therefor

1997-08-04

1999-04-06

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327156, 327159, 327 12, 327176, H03K 3017

Patent

active

058923802

ABSTRACT:
A phase-frequency detector (12) is configured for operating at a high frequency. A transition of a clock signal (REF CLK) is detected by a first latch (52) and a signal UP is generated. A transition of a feedback signal (FBK) is detected by a second latch (56) and a signal DOWN is generated. An logic circuit (64) detects the signals UP and the DOWN and generates a reset signal (RESET). A pulse-width of the reset signal (RESET) is controlled and limited by the logic circuit (64) to provide a faster response time for setting the first and second latches (52 and 56) to a state that allows detection of the phase and frequency differences between the clock signal (REF CLK) and the feedback signal (FBK).

REFERENCES:
patent: 5539345 (1996-07-01), Hawkins

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