Constant current source circuit

Details Constant current source circuit Constant current source circuit

1989-12-20

1990-12-04

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323316, 3072968, G05F 324

Patent

active

049756311

ABSTRACT:
A constant current source circuit comprises a first FET connected to a first voltage line at its drain region and to a second voltage line through an impedance circuit at its source region and gate in common; a second FET connected to the first voltage line at its drain region and its source region and gate being connected to each other; a third FET connected to the source region of the second FET at its drain region, to the second voltage line at its source region and to the source region of the first FET at its gate; and a fourt FET connected to a current output node of the circuit at its drain region, to the second voltage line at its source region and to the source region of the second FET at its gate. Every FET is operated at the saturation state.

REFERENCES:
patent: 4270081 (1981-05-01), Hareyama
patent: 4281261 (1981-07-01), Adam
patent: 4361797 (1982-11-01), Kojima et al.
patent: 4442398 (1984-04-01), Bertails et al.
patent: 4532467 (1985-07-01), Mensink et al.

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