Operational amplifier utilizing JFET followers

Details Operational amplifier utilizing JFET followers Operational amplifier utilizing JFET followers

1986-12-29

1987-12-15

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

047136260

ABSTRACT:
An operational amplifier includes a pair of differentially coupled PNP transistors driving a current mirror circuit. The base of the each of the transistors is coupled to the source of a JFET follower transistor each of which in turn has a gate coupled to one of the amplifier's inputs. First and second current sources are coupled to the source electrodes of each of the JFETs for the purpose of supplying a current thereto equal to that JFET's I.sub.DSS (its drain current when its gate and source are shorted).

REFERENCES:
patent: 4517524 (1985-05-01), Davis

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