Improved operational amplifier utilizing JFET followers.

摘要

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 (10, 12). 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 IDSS (its drain current when its gate and source are shorted).