Constant current circuit

Details Constant current circuit Constant current circuit

1989-12-20

1991-03-12

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

G05F 326

Patent

active

049995677

ABSTRACT:
First and second MOS transistors are connected through a first resistance to each other in series between first and second potentials. Third and fourth MOS transistors are connected in series between the first and second potentials. Gates of the first and third MOS transistors are commonly connected to each other, and connected to a drain of the third MOS transistor. A diode, a Zener diode, and a second resistance are connected in series between the first and second potentials, such that cathodes of the diode and the Zener diode are connected to each other. A constant voltage generated at a connecting point between the second resistance and the serial connection of the diode and the Zener diode is applied to a gate of the fourth MOS transistor. A constant current circuit thus obtained operates with a low voltage and is adapted to be connected even to a comparator having a large dependency on the threshold voltages.

REFERENCES:
patent: 4287438 (1981-09-01), Cave et al.
patent: 4906914 (1990-03-01), Ohsawa

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