Direct current offset canceling circuit of trans-impedance...

Details Direct current offset canceling circuit of trans-impedance... Direct current offset canceling circuit of trans-impedance...

2007-06-26

2007-06-26

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

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

C330S009000, C250S2140AG

Reexamination Certificate

active

11232860

ABSTRACT:
A direct current (DC) offset canceling circuit of a trans-impedance amplifier and an automatic gain control trans-impedance amplifier is provided, including: a trans-impedance amplifier for receiving an input current and converting the input current into a first voltage signal, while the trans-impedance amplifier is provided with a plurality of inverters connected in series, wherein a sample node is defined between each inverter; a DC detector for retrieving and comparing the signals at any sample node, thereby generating a trigger signal according to the comparison; a DC eliminator for providing a path to the DC component of the input current in response to the triggering by the signal trigger, to eliminate the DC component; a reference voltage unit for outputting a reference voltage value; and a voltage output amplifier for comparing the reference voltage and the first voltage signal, to amplify the output of a second voltage signal.

REFERENCES:
patent: 6084232 (2000-07-01), Kimura
patent: 6342694 (2002-01-01), Satoh
patent: 6552605 (2003-04-01), Yoon
patent: 6774728 (2004-08-01), Seetharaman et al.
patent: 6833762 (2004-12-01), Seetharaman et al.

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