Amplifier circuit having signal detection function

Details Amplifier circuit having signal detection function Amplifier circuit having signal detection function

2006-05-16

2006-05-16

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

C330S140000

Reexamination Certificate

active

07046092

ABSTRACT:
In an amplifier circuit, a main amplification section includes an amplifier for amplifying an input signal and a reference voltage generation circuit for generating a reference voltage from an output signal of the amplifier. Other main amplification sections each including the same internal structure are cascade-connected. A switch is provided for selecting any of amplifier outputs of these main amplification sections. A frequency component lower than that of an input signal to the amplifier circuit is removed by a filter circuit, and thereafter, the presence/absence of an input signal is detected by an amplitude detection circuit and a comparator. With such a structure, even if the input signal abruptly changes, e.g., immediately after the start of communication or immediately after the end of communication, an optical signal input is correctly detected and reproduced.

REFERENCES:
patent: 6549068 (2003-04-01), Bollenbeck
patent: 6556330 (2003-04-01), Holcombe

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