Current mirror circuit

Details Current mirror circuit Current mirror circuit

1996-04-05

1997-12-30

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

327538, G05F 304, G05F 316

Patent

active

057034788

ABSTRACT:
A current mirror circuit (31) that includes an active loop which operates transistors of different conductivity type at equal base-emitter junction voltages to minimize error. A first resistor (38) couples to a base of a first transistor (32) of a first conductivity type in a voltage follower configuration. A reference current is coupled to the first resistor (38). The voltage across the first resistor (38) and base-emitter junction of the first transistor (32) is mirrored across the base-emitter junction of a second transistor (34) of a second conductivity type and a second resistor (39). A third transistor (35) of the second conductivity type in a diode configuration is coupled to receive current from the second transistor (34). The voltage across the third transistor (35) biases a fourth transistor (33) of a first conductivity type. The current from the fourth transistor (33) is provided to the first transistor such that the first and second transistors (32,34) operate at equal base-emitter voltages.

REFERENCES:
patent: 4654602 (1987-03-01), Aoki
patent: 5451859 (1995-09-01), Ryat
patent: 5592076 (1997-01-01), Main et al.
patent: 5625282 (1997-04-01), Kawahara

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