Current source circuit

Details Current source circuit Current source circuit

1993-06-21

1995-03-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Miscellaneous

323315, 327530, 327 65, H03K 335

Patent

active

054020115

ABSTRACT:
A small value current source circuit utilized in bipolar integrated circuits. A reference potential is level-shifted by a first level shift circuit and applied to one input of a differential amplifier. The reference potential is also level-shifted by a second level shift circuit and applied to the other input of the differential amplifier. A constant current source circuit supplies currents both proportional to the currents flowing in the differential amplifier and of mutually different values to the first and second level shift circuits. The differential amplifier amplifies the difference of the input voltages and produces an output current.

REFERENCES:
patent: 4359653 (1982-11-01), Takamasa
patent: 4525636 (1985-06-01), Kominami et al.
patent: 4577119 (1986-03-01), Kim et al.
patent: 4691174 (1987-09-01), Nelson et al.
patent: 5134309 (1992-07-01), Matsumoto et al.
Shoji, "Constant Current Circuit", Abstract of Japanese Patent Laid-Open No. 1-12705, (1989).

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