Differential amplifier circuit providing high gain output at low

Details Differential amplifier circuit providing high gain output at low Differential amplifier circuit providing high gain output at low

1993-12-22

1994-12-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

053768973

ABSTRACT:
A differential amplifier circuit having a differential pair including first and second transistors of a first conductivity type, emitters of which are connected to each other, a first current source circuit disposed between the emitters of said first and second transistors and a first power source, a second current source circuit disposed between a collector of the first transistor and a second power source, a third current source circuit disposed between a collector of the second transistor and the second power source, and an active load circuit including a third transistor of the first conductivity type, having a collector connected to the collector of the first transistor and an emitter connected to the first power source, a fourth transistor of the first conductivity type, having a collector connected to the collector of the second transistor and an emitter connected to the first power source, a first load resistor disposed between the collector of the third transistor and a common connection node of bases of the third and fourth transistors and a second load resistor disposed between the collector of the fourth transistor and the common connection node of the bases of the third and fourth transistors.

REFERENCES:
patent: 4547744 (1985-10-01), Kasperkovitz
patent: 4937515 (1990-06-01), Yoshino
patent: 5132640 (1992-07-01), Tanaka et al.

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