Automatic offset control circuit for digital receiver

Details Automatic offset control circuit for digital receiver Automatic offset control circuit for digital receiver

1994-04-18

1996-07-23

Chin, Stephen

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

375319, 375345, 330260, 329319, 329350, 327 60, 327 73, 327307, 327323, H04L 2506

Patent

active

055397794

ABSTRACT:
An automatic offset control circuit comprises a differential output preamplifier having an offset adjustment function, further comprising an average detector, a peak detector, and a differential input amplifier. The average detector generates a reference voltage representing an average value of a positive output and a negative output of the preamplifier. The peak detector outputs a peak voltage representing a peak of the negative output of the preamplifier. The differential input amplifier compares the peak voltage with the reference voltage to output an offset adjustment signal to the preamplifier. The offset adjustment signal is obtained based on a difference between the reference voltage and the peak voltage. A bottom detector may be used instead of the peak detector, provided a bottom value is detected using the positive output of the preamplifier.

REFERENCES:
patent: 5025251 (1991-06-01), Mittel et al.
patent: 5052021 (1991-09-01), Goto et al.
patent: 5412692 (1995-05-01), Uchida
Journal of Lightwave Technology., vol. 8, No. 12, Dec. 1990, New York U.S. pp. 1897-1903.
Patent Abstracts of Japan., vol. 17, No. 183.
"DC Coupled Burst Mode Optical Receiver with High Speed ATC Circuit", Takeshi Nagahori and Kazuhisa Kaede, Opto-Electronics Research Laboratories, Jul. 1992, p. 4-110.

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