Constant current circuit

Details Constant current circuit Constant current circuit

1995-08-11

1996-12-24

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 323907, G05F 304, G05F 316

Patent

active

055876552

ABSTRACT:
A constant current circuit of the invention supplies a constant current to a load. The constant current circuit is formed of a current source device for providing an input current having a predetermined value with temperature dependence, a voltage divider device connected to the current source device, and an output transistor device. A reference transistor device or an adjusting transistor device is attached to the current source device. In case the reference transistor device is used, the voltage divider device divides a reference voltage of the reference transistor device to thereby generate a control voltage. In case the adjusting transistor device is used, an adjusting voltage from the voltage divider device is supplied to the adjusting transistor device to generate a control voltage. The output transistor device is connected to the load for controlling an output current supplied to the load in response to the control voltage. Temperature dependence of the output current is adjusted by setting voltage dividing ratio of the voltage divider device.

REFERENCES:
patent: 4716356 (1987-12-01), Vyne et al.
patent: 5047706 (1991-09-01), Ishibashi et al.
patent: 5173656 (1992-12-01), Seevinck et al.
patent: 5384529 (1995-01-01), Nakage
patent: 5512855 (1996-04-01), Kimura
Analysis and Design of Analog Integrated Circuits, Second Edition by Paul R. Gray and Robert G. Meyer.
CMOS Analog Circuit Design, Phillip E. Allen and Douglas R. Holberg.

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