Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1990-09-19
1992-02-11
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330262, 330265, 330270, 330 9, 330293, H03F 345
Patent
active
050878905
ABSTRACT:
An amplifier circuit includes a negative feedback connected amplifier and a series circuit comprising a capacitor, one end of which is connected to an output terminal of the amplifier, and a resistor, one end of which is connectable to a reference potential. A comparator is provided which has first and second inputs and one output. The first input is connected to a junction between the capacitor and the resistor, the second input is connected to an output of the amplifier, and the output of the comparator is connected to one input of the amplifier. The comparator does not react to an AC signal of a specific frequency band, but operates to set the output offset voltage only to one fractional part of the transition gain, and therefore operates to accomplish offset compensation without using a large capacitor.
REFERENCES:
patent: 3263177 (1966-07-01), Durrett
patent: 3768028 (1973-10-01), Wolcott et al.
patent: 3918005 (1975-11-01), Bruckenstein et al.
patent: 4490682 (1984-12-01), Poulo
patent: 4928059 (1990-05-01), Franklin et al.
IBM Technical Disclosure Bulletin, vol. 26, No. 3B, Aug. 1983, pp. 1377-1378, Engelbrecht: "Input Offset Compensation for Photodiode Amplifier".
Fujisawa Masanori
Ishiguro Kazuhisa
Dinh Tan
LaRoche Eugene R.
Sanyo Electric Co,. Ltd.
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