Amplifier and semiconductor device which are operated at a low v

Details Amplifier and semiconductor device which are operated at a low v Amplifier and semiconductor device which are operated at a low v

1997-01-28

1998-08-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330257, 330261, H03F 345

Patent

active

057899800

ABSTRACT:
An amplifier and a semiconductor device according to the present invention are operated at a low voltage and decreased in size and problems such as a noise and an oscillation phenomenon. The amplifier and semiconductor device each includes a first bias generation circuit for generating first and second bias voltages when V1.gtoreq.V2, where V1 is the power supply voltage and V2 is the lower limit of the operation limiting voltage, and for outputting a zero potential when V1<V2, a first amplification circuit for amplifying an input signal by the first bias voltage and for opening an output terminal by the zero potential, a second amplification circuit of a push-pull type operated in response to the input signal and the output signal of the first amplification circuit, and a second bias generation circuit for supplying a bias current to the second amplification circuit by the zero potential when V2>V1.gtoreq.V3, where V3 (<V2) is a lower limit of the operation limiting voltage, and for opening the output terminal when V1.gtoreq.V2. The second amplification circuit performs a push-pull operation when V1.gtoreq.V2 and only one of push-pull transistors performs an amplification operation when V2>V1.gtoreq.V3.

REFERENCES:
patent: 4800339 (1989-01-01), Tanimoto et al.

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