Demodulating circuit and optical receiving circuit

Details Demodulating circuit and optical receiving circuit Demodulating circuit and optical receiving circuit

2005-05-10

2005-05-10

Tokar, Michael (Department: 2819)

Pulse or digital communications

Transmitters

C375S316000

Reexamination Certificate

active

06891900

ABSTRACT:
A demodulating circuit includes a differentiating circuit that outputs a differentiated signal indicating voltage changes at rising and falling edges of a received pulse signal, and a hysteresis comparator that compares the differentiated signal with upper and lower threshold voltages, thereby generating a demodulated logic-level signal. The differentiating circuit can rapidly track variations in the direct-current offset of the received pulse signal. Positive feedback can enable the hysteresis comparator to maintain the correct output logic level during runs of 0's or 1's of arbitrary length in the received pulse signal. The demodulating circuit consumes comparatively little power, and is particularly useful for receiving signals transmitted in bursts.

REFERENCES:
patent: 5412692 (1995-05-01), Uchida
patent: 5612810 (1997-03-01), Inami et al.
patent: 6104238 (2000-08-01), Mattisson et al.
patent: 6151150 (2000-11-01), Kikuchi
patent: 6496549 (2002-12-01), Crawford
patent: 20030123567 (2003-07-01), Shigemasa et al.
patent: 08-84160 (1996-03-01), None
patent: 10-163828 (1998-06-01), None

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