Operational amplifier

Details Operational amplifier Operational amplifier

2005-07-26

2005-07-26

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S264000, C330S267000

Reexamination Certificate

active

06922105

ABSTRACT:
In an operational amplifier, a differential amplifying circuit is configured to amplify an input voltage inputted from the input terminal. An outputting transistor is connected to the output terminal. A driving transistor is connected to the differential amplifying circuit and the outputting transistor. The driving transistor turns on according to a control signal supplied from the differential amplifying circuit to the driving circuit. The driving transistor is also configured to drive the outputting transistor according to the control signal. A control signal reducing circuit, when a voltage is applied on the driving transistor through the outputting transistor, is configured to reduce the control signal within a range that the driving transistor is kept to on state. The voltage applied on the driving transistor exceeds a predetermined threshold voltage.

REFERENCES:
patent: 5905617 (1999-05-01), Kawasoe
patent: 6232824 (2001-05-01), Kono
patent: 6566957 (2003-05-01), Caine
patent: 49-63366 (1974-06-01), None
patent: 55-154809 (1980-12-01), None
patent: 5-259544 (1993-10-01), None
patent: 7-227035 (1995-08-01), None
patent: 8-307224 (1996-11-01), None
patent: 9-8562 (1997-01-01), None
patent: 11-46120 (1999-02-01), None
patent: 2001-35160 (2001-02-01), None

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