Apparatus for detecting when a dynamic signal is stable

Details Apparatus for detecting when a dynamic signal is stable Apparatus for detecting when a dynamic signal is stable

1997-12-18

1999-11-30

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375377, H04L 2706

Patent

active

059955643

ABSTRACT:
An apparatus for detecting when a dynamic signal is stable. The apparatus is couplable to a first charge pump connected to receive the dynamic signal and generate a first signal as a function of the dynamic signal. The first charge pump has a predetermined capacitance and current. In one embodiment, the apparatus includes: (1) a second charge pump connected to receive the dynamic signal and in parallel with the first charge pump, the second charge pump having a smaller capacitance and discharge current than the first charge pump and configured to produce a second signal as a function of the dynamic signal, (2) a third charge pump connected to receive the dynamic signal and in parallel with the first charge pump and the second charge pump, the third charge pump having a smaller capacitance and larger discharge current than the first charge pump and configured to produce a third signal as a function of the dynamic signal and (3) control logic configured to receive the second and third signals and produce an active signal when the second and third signals are substantially opposite to each other, logically, indicating that the dynamic signal is stable.

REFERENCES:
patent: 5511235 (1996-04-01), Duong
patent: 5592120 (1997-01-01), Palmer et al.
patent: 5699018 (1997-12-01), Yamamoto et al.
"A Low Jitter 5 MHz to 180 MHz Clock Synthesizer for Video Graphics" 1992 IEEE; AT&T Bell Laboratories (1 pg.).

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