Base-current compensation circuit to reduce input offset voltage

Details Base-current compensation circuit to reduce input offset voltage Base-current compensation circuit to reduce input offset voltage

1998-06-17

1999-08-24

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330267, H03F 345

Patent

active

059429410

ABSTRACT:
A bipolar operational amplifier circuit includes: a differential pair having a first transistor Q.sub.1 and a second transistor Q.sub.2 ; a third transistor Q.sub.6 having a first node coupled to a first node of the first transistor Q.sub.1 ; a fourth transistor Q.sub.9 having a first node coupled to a first node of the second transistor Q.sub.2 ; a fifth transistor Q.sub.8 having a first node coupled to the first transistor Q.sub.1 ; a sixth transistor Q.sub.11 having a first node coupled to the second transistor Q.sub.2 ; a current mirror 20 having a first branch coupled to a second node of the fifth transistor Q.sub.8 and a second branch coupled to a second node of the sixth transistor Q.sub.11 ; a seventh transistor Q.sub.27 having a base coupled to the first branch of the current mirror 20; an eighth transistor Q.sub.28 having a base coupled to the third transistor Q.sub.6 ; a ninth transistor Q.sub.20 having a first node coupled to a first node of the seventh transistor Q.sub.27 and a base coupled to the sixth transistor Q.sub.11 ; and a tenth transistor Q.sub.18 having a first node coupled to a first node of the eighth transistor Q.sub.28 and a base coupled to the sixth transistor Q.sub.11.

REFERENCES:
patent: 4041407 (1977-08-01), Main
patent: 5389894 (1995-02-01), Ryat
patent: 5512859 (1996-04-01), Moraveji

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