Operational amplifier

Details Operational amplifier Operational amplifier

1988-05-23

1989-05-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

048292656

ABSTRACT:
An operational amplifier includes a first and second input JFETs having gate electrodes which are coupled to first and second input terminals respectively. A single ended output is taken from the drain of one of the JFETs and applied to an output gain stage including a Miller compensation capacitor. Circuitry is provided for producing a low impedance at the drain of the second JFET at high operating frequencies. This circuitry comprises an NPN transistor having an emitter coupled to ground, a base coupled to the drain of the first JFET, and a collector coupled via a resistor to the common sources of the input JFETs. A capacitor is coupled between the collector of the NPN transistor and the drain of the first JFET.

REFERENCES:
patent: 4701718 (1987-10-01), Wrathall et al.

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