Differential input stage for differential line receivers and ope

Details Differential input stage for differential line receivers and ope Differential input stage for differential line receivers and ope

1987-05-29

1988-11-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

307356, H03F 345

Patent

active

047885106

ABSTRACT:
An improved differential input amplifier stage used as the input stage in digital differential line receives or operational amplifiers. The differential input amplifier stage has a pair of input transistors forming a differential pair with a common output node and two complementary output nodes; a current mirror, coupled to the two complementary output nodes and responsive to a first one of the two complementary output nodes and a single-ended output signal on the second one of the two complementary output nodes; and a current source transistor coupled to the common output node and responsive to the first one of the two complementary output nodes. The current source transistor maintains the voltage on the first one of the two complementary output nodes substantially constant, thereby improving common mode and power supply noise immunity and providing faster differential response by the differential input amplifier stage.

REFERENCES:
patent: 4371843 (1983-02-01), Fang et al.
patent: 4379267 (1983-04-01), Young
patent: 4598215 (1986-07-01), Schechtman et al.
patent: 4606012 (1986-08-01), Koshizuka
patent: 4630284 (1986-12-01), Cooperman
Analysis and Design of Analog Integrated Circuits, Second Edition, Paul R. Gray and Robert G. Meyer, Copyright 1977, 1984 by John Wiley & Sons, Inc.
"Analysis and Design of Analog Integrated Circuits", Second Addition, Paul R. Gray & Robert G. Meyer, pp. 705-709 and 741-744, John Wiley & Sons, 1977 and 1984.

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