Constant-current circuit

Details Constant-current circuit Constant-current circuit

1975-08-28

1977-06-21

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

331186, G05F 308

Patent

active

040314561

ABSTRACT:
A constant-current circuit has a depletion type FET and a series circuit consisting of an impedance element and an enhancement type FET connected in parallel between two terminals. The gate electrodes of the respective FET's are connected to a juncture between the impedance element and the enhancement type FET, and current which flows through the depletion type FET is set to be sufficiently larger than a current which flows through the series circuit. The voltage across the enhancement type FET is made substantially equal to a threshold voltage thereof, whereby the constant current characteristics of such constant-current circuits are checked from being dispersed.

REFERENCES:
patent: 3508084 (1970-04-01), Warner
patent: 3806742 (1974-04-01), Powell
patent: 3815354 (1974-06-01), Strocka et al.

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