Amplifying circuit using offset value variable circuit

Details Amplifying circuit using offset value variable circuit Amplifying circuit using offset value variable circuit

1997-04-17

1998-11-24

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330269, H03F 326

Patent

active

058413219

ABSTRACT:
An amplifying circuit includes a first amplifier having a first input terminal, a second input terminal, and an output terminal for pushing an output current; a second amplifier having a first input terminal, a second input terminal, and an output terminal for pulling an output current; a circuit for detecting the output current of an operational amplifier in the second amplifier; and an offset voltage generating circuit for generating an offset voltage. In the amplifying circuit, the offset voltage is applied between the first input terminal of the first amplifier and the first input terminal of the second amplifier, the first input terminal of the first amplifier is connected to a first input signal terminal, the second input terminal of the first amplifier and the second input terminal of the second amplifier are connected to the second input signal terminal, and the output terminal of the first amplifier and the output terminal of the second amplifier are connected to each other, and the amplifying circuit supplies an output current from the connecting point. The amplifying circuit reduces the power consumption caused by the offset voltage of an operational amplifier and a relative error of the resistance value of resistors used in the circuit when no signal is input, and reduces the cross-over distortion of an output signal.

REFERENCES:
patent: 4677391 (1987-06-01), Kawakami
patent: 4888559 (1989-12-01), Sevenhans et al.
patent: 5216382 (1993-06-01), Ito
patent: 5334950 (1994-08-01), Arimoto
patent: 5361041 (1994-11-01), Lish
patent: 5606281 (1997-02-01), Gloagen
patent: 5652545 (1997-07-01), Miyashita et al.

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