Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2005-08-29
2010-10-05
Pascal, Leslie (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S202000
Reexamination Certificate
active
07809285
ABSTRACT:
A receiving circuit comprises a transimpedance amplifier3including an inversion amplifier2for amplifying an input current IN, and a feedback resistance R1connected between an input and an output of the inversion amplifier2, a comparison circuit4for comparing an output OUT of the transimpedance amplifier3with a certain desired reference value, and outputting a result of the comparison, and a control circuit for holding the comparison result, and generating an AGC signal20for adjusting a gain of the transimpedance amplifier3. The transimpedance amplifier20has a function capable of gain adjustment in accordance with the input AGC signal20. The control circuit5performs gain adjustment until the output OUT of the transimpedance amplifier3exceeds the reference value so that an appropriate gain is obtained. Therefore, even when an input has a wide dynamic range, it is possible to prevent signal saturation and a distortion in output waveform in the transimpedance amplifier, so that appropriate reception can be invariably performed and a signal having a stable duty can be output.
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Japanese Notice of Reasons for Rejection, w/ English translation thereof, issued in Japanese Patent Application No. JP 2006-535118 dated Apr. 13, 2010.
Kimura Hiroshi
Nishimura Kazuko
McDermott Will & Emery LLP
Panasonic Corporation
Pascal Leslie
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