Constant current circuit

Details Constant current circuit Constant current circuit

1987-12-16

1989-04-25

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323316, G05F 324

Patent

active

048251453

ABSTRACT:
A constant current circuit includes a first FET providing an input reference current flow, a second FET providing an output current flow and a non-linear impedance element connected between the drain and the gate of the first FET. By setting a parameter of the non-linear impedance element and a parameter of the first FET to have a specific relationship with each other, the output current can be maintained at a substantially definite value irrespective of relatively large variations of the input reference current.

REFERENCES:
patent: 4008406 (1977-02-01), Kawagoe
patent: 4327321 (1982-04-01), Suzuki et al.
patent: 4453121 (1984-06-01), Noufer
patent: 4686449 (1987-08-01), Jeffrey et al.

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