PNP transistor base drive compensation circuit

Details PNP transistor base drive compensation circuit PNP transistor base drive compensation circuit

1991-08-13

1992-10-20

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

3072961, 330257, 330288, H03F 318

Patent

active

051573229

ABSTRACT:
In an integrated circuit a PNP current mirror can lose its current reflection accuracy when low Beta transistors are involved. Since the conventional PNP transistors can often have low Beta this can become a serious problem particularly with high current gain plural output current mirrors. In the invention a compensation current is fed to the current mirror to increase the PNP transistor base currents as an inverse function of Beta. Several alternative circuit embodiments are also disclosed.

REFERENCES:
patent: 3962592 (1976-06-01), Thommen et al.
patent: 4437023 (1984-03-01), Gill, Jr.
patent: 4528496 (1985-07-01), Naokawa et al.
patent: 4546307 (1985-10-01), Llewellyn
patent: 4700144 (1987-10-01), Thomson
patent: 4965510 (1990-10-01), Kriedt et al.

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