Digital signal receiver circuit

Details Digital signal receiver circuit Digital signal receiver circuit

1997-05-22

1999-04-06

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250214A, 330 59, 330308, 375318, H04B 1006

Patent

active

058926097

ABSTRACT:
An optical signal is converted by a light-receiving element into a photoelectric current. The photoelectric current is converted by a preamplifier into a positive phase voltage and the opposite phase voltage. The peaks of the positive phase output and opposite phase output are sensed and held by a first and second peak sensing circuits. The median between the output of the second peak sensing circuit and the positive phase output of the preamplifier is determined by a first median output circuit. The median between the output of the first peak sensing circuit and the opposite phase output of the preamplifier is determined by a second median output circuit. A level comparison circuit compares the outputs of the first and second median output circuits and produces a signal voltage with a constant amplitude within a specific input voltage range, thereby producing a reception signal. This helps alleviate duty fluctuations and the deterioration of the reception sensitivity resulting from the dark current of the light-receiving element or fluctuations in the output offset voltage of the preamplifier.

REFERENCES:
patent: 5025456 (1991-06-01), Ota et al.
patent: 5612810 (1997-03-01), Inami et al.
Makoto Nakamura, et al., Custom Integrated Circuits Conference, No. CONF. 16, pp. 629-632, 1994, "A Wide-Dynamic-Range and Extremely High-Sensitivity CMOS Optical Receiver IC Using Feed-Forward Auto-Bias Adjustment".
Charles A. Eldering, Journal of Lightwave Technology, vol. 11, No. 12, pp. 2145-2149, Dec. 1993, "Theoretical Determination of Sensitivity Penalty for Burst Mode Fiber Optic Receivers".

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