Operational amplifier having stable operations for a wide range

Details Operational amplifier having stable operations for a wide range Operational amplifier having stable operations for a wide range

1995-03-29

1997-02-25

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330264, H03F 326

Patent

active

056062877

ABSTRACT:
An operational amplifier has a differential amplification section, an output section, a control signal generation unit, and a drive control unit. The output section has a first transistor of a first conductivity type and a second transistor of a second conductivity type that is opposite to the first conductivity type. The first and second transistors are connected in series between a first power source unit and a second power source unit, and the first transistor is driven according to an output of the differential amplification section. The control signal generation unit is used to detect a current flowing through the first transistor and generate a control signal in response to the detected current. The drive control unit is used to drive the second transistor in response to the control signal.

REFERENCES:
patent: 4599575 (1986-07-01), Bernard
patent: 4800339 (1989-01-01), Tanimoto et al.
patent: 4912425 (1990-03-01), Kobayashi et al.
patent: 5055796 (1991-10-01), Schaffer

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