Operational amplifier

Details Operational amplifier Operational amplifier

2006-08-31

2008-08-19

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07414474

ABSTRACT:
An operational amplifier with a broad applicable band and little disturbing noise which is capable of preventing oscillation even when used in connection with a negative feedback path. The operational amplifier amplifies a difference between two input voltage signals to a non-inverting input terminal and an inverting input terminal and outputs the amplified difference to an output terminal. The operational amplifier includes an input voltage/current conversion stage which outputs, to the non-inverting input terminal and the inverting input terminal, a current signal having a difference current component in accordance with the difference between the two input voltage signals; a current amplification stage which performs current amplification on the current signal outputted from the input voltage/current conversion stage; and an output buffer stage which converts, into a voltage signal, the output current signal from the current amplification stage and applies the voltage signal to the output terminal.

REFERENCES:
patent: 5327100 (1994-07-01), Stockstad et al.
patent: 5475339 (1995-12-01), Maida
patent: 5642078 (1997-06-01), Navabi et al.
patent: 6268769 (2001-07-01), Yamauchi et al.
“Semiconductor Introductory Course 2, Semiconductor Circuit II by Program Learning”, pp. 179-181, written and edited by the Vocational Training Development Textbook Committee (Kosaido Publishing 1990).

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