Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-08-11
1999-09-21
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330279, 330136, H03F 345
Patent
active
059559217
ABSTRACT:
The present invention discloses a signal amplifier circuit used in, for example, a receive portion in an optical communication system, and including an automatic threshold value setting portion to automatically set a threshold value depending upon a "1" side level and a "0" side level of an input signal, an automatic gain control amplifying portion to take as inputs the input signal and the threshold value from the automatic threshold value setting portion so as to perform differential amplification, and a gain control portion to detect amplitude information of the input signal so as to feed a gain control signal according to amplitude of the input signal to the automatic gain control amplifying portion as a feedforward signal. It is thereby possible to avoid limitation of a signal amplified in the signal amplifier circuit at a time of reproduction of a pulse signal, and compensate for offsets present in circuits so as to suppress a variation in pulse width of the output signal.
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Chiba Takaya
Ide Satoshi
Nobuhara Hiroyuki
Fujitsu Limited
Nguyen Khanh Van
Pascal Robert
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