Differential amplifier with input bias current cancellation

Details Differential amplifier with input bias current cancellation Differential amplifier with input bias current cancellation

1987-12-09

1989-06-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

048433420

ABSTRACT:
A bias current cancellation circuit provides current to the bases of a pair of transistors forming a differential amplifier. A transistor of matched characteristics to the differential amplifier pair is operated so that its base current replicates the base currents of the differential transistor pair. This replicated base current is inverted by a current mirror which is connected to the bases of the differential transistional pair. A second order cancellation error caused by base current differences in the current mirror is cancelled by a feedback circuit so that only the base current of the matching transistor affects the currents supplied to differential amplifier.

REFERENCES:
patent: 4575685 (1986-03-01), Dobkin et al.
Article entitled "Precision Op Amp Serves Host of Design Needs", Electronic Design, pp. 95-100, (Sep. 1, 1983).

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