Bipolar differential input stage with input bias current...

Details Bipolar differential input stage with input bias current... Bipolar differential input stage with input bias current...

2005-11-15

2005-11-15

Mai, Lam T. (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000, C330S296000, C327S589000, C327S478000

Reexamination Certificate

active

06965267

ABSTRACT:
A bipolar differential input stage with an input bias current cancellation circuit comprises an input pair and a bipolar tracking transistor. The input stage is arranged such that the collector currents in the input pair and tracking transistor, and the collector-emitter voltages of the input pair and tracking transistor, are substantially equal. A lateral PNP transistor's first collector provides the tracking transistor base current required to achieve the substantially equal collector current, and second and third collectors provide copies of the tracking transistor base current as bias current cancellation currents to the bases of the input pair, thereby reducing the input stages' input bias currents.

REFERENCES:
patent: 3714600 (1973-01-01), Kujik et al.
patent: 4575658 (1986-03-01), Kay
patent: 4575685 (1986-03-01), Dobkin et al.
patent: 4639684 (1987-01-01), Laude
patent: 4755770 (1988-07-01), Groom et al.
patent: 4780688 (1988-10-01), Groom
patent: 4843342 (1989-06-01), Hester et al.
patent: 5812028 (1998-09-01), Adachi et al.
patent: 6469578 (2002-10-01), Smith
patent: 6549072 (2003-04-01), Vernon
patent: 6636111 (2003-10-01), Gross et al.
Linear Technology, Dual/Quad 135μA, 14Nv/Hz, Rail-to-Rail Output Precision Op Amp, LT6011/LT6012, p. 1-16, no month, no year.

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