Base current compensation circuit

Details Base current compensation circuit Base current compensation circuit

1995-07-05

1997-04-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

323315, 323312, G05F 110

Patent

active

056170564

ABSTRACT:
A base current compensation circuit (10) generates a current that tracks a gain of a transistor (11). The compensation circuit (10) includes a current mirror formed by a mirror transistor (12) and an output transistor (14). The mirror transistor (12) is connected to the transistor (11) whose gain is tracked. A current source (16) and a feedback transistor (13) causes the mirror transistor (12) to draw a base current from the transistor (11) so that a collector current of the transistor (11) matches a reference current. The output transistor (14) amplifies the base current of the transistor (11) to generate the tracking current in the collector electrode of the output transistor (14).

REFERENCES:
patent: 4462005 (1984-07-01), Kusakabe et al.
patent: 4475077 (1984-10-01), Nagano
patent: 4591804 (1986-05-01), van Tuijl
patent: 5027014 (1991-01-01), Bass et al.
patent: 5079518 (1992-01-01), Wakayama
patent: 5180967 (1993-01-01), Yamazaki
patent: 5245273 (1993-08-01), Greaves et al.
patent: 5373253 (1994-12-01), Bailey et al.

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