Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

1988-06-02

1989-08-08

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345

Patent

active

048556866

ABSTRACT:
Disclosed is a differential amplifier circuit which includes a first NPN transistor, a second NPN transistor, a current source connected to the emitters of the first and second NPN transistors, a first PNP load transistor having a collector connected to the collector of the first NPN transistor, a second PNP load transistor having a collector coupled to the collector of the second NPN transistor, and an FET having a gate connected to the collector of the first NPN transistor, and a source connected to the bases of the first and second PNP load transistors. A DC input current of the FET is substantially zero, and is designed to absorb a current corresponding to the gate potential of the FET, from the bases of the first and second PNP load transistors.

REFERENCES:
patent: 4683442 (1987-07-01), Vyne

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