Operational amplifier having a wide input/output range and an im

Details Operational amplifier having a wide input/output range and an im Operational amplifier having a wide input/output range and an im

1998-09-03

2000-08-08

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330292, H03F 345

Patent

active

061007625

ABSTRACT:
An operational amplifier having an input stage including a differential transistor pair and an output stage receiving an output of the input stage for outputting an output signal having a wide output range. The input stage includes a field effect transistor connected in parallel to a constant current source for the differential transistor pair and having a gate connected to receive a level-shifted signal of an output of the input stage, so that when the output signal of the output stage changes, the field effect transistor is turned on so as to supplying an additional bias current to the differential transistor pair in addition to a bias current supplied by the constant current source, so that the slew rate of the output signal of the output stage is elevated.

REFERENCES:
patent: 5670910 (1997-09-01), Kato
patent: 5777515 (1998-07-01), Kimura
Japanese Office Action issued Feb. 15, 2000 in a related application and English translation of relevant portions.

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