Differential input stage having improved common mode rejection

Details Differential input stage having improved common mode rejection Differential input stage having improved common mode rejection

1990-09-04

1991-07-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, M03F 345

Patent

active

050327976

ABSTRACT:
A differential input stage is provided having primary and secondary differential input transistors, wherein the secondary differential transistors operating in response to the same common mode input signal conduct equal currents as flowing through the primary differential transistors into a dual output current mirror for supplying the nominal current flowing in the primary differential transistors. Since the dual output current mirror is supplying the current flowing through the primary differential transistors, a differential to single-ended converter normally operating in response to differential currents flowing through the primary differential transistors does not conduct any incremental current induced by the common mode input signal, hence, there is no change in the output voltage thereof.

REFERENCES:
patent: 4213098 (1980-07-01), Tsvidis
patent: 4897611 (1990-01-01), Laber et al.

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