Constant current circuit

Details Constant current circuit Constant current circuit

1980-06-11

1982-04-27

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

307304, G05F 308

Patent

active

043273211

ABSTRACT:
A constant current circuit is provided which is capable of feeding a constant current to a load connected in series with the source-drain path of a load drive MOSFET. The circuit employs a current mirror comprising first and second P channel MOSFETs, and first and second N channel MOSFETs connected in series with the first and second P channel MOSFETs, respectively. To avoid dependence on variations in power source voltage and/or threshold voltage characteristics of the MOSFETs, a resistor is inserted between the first P and N channel MOSFET's and the gate of the load drive MOSFET is coupled to both the junction of the resistor and first N channel MOSFET and to the gate of the second N channel MOSFET. Variations of this basic arrangement are also disclosed.

REFERENCES:
patent: 4031456 (1977-06-01), Shimada et al.
patent: 4048590 (1977-09-01), Dobberpuhl
patent: 4230980 (1980-10-01), Sano et al.
patent: 4281261 (1981-07-01), Adam
IEEE Journal of Solid-State Circuits, vol. SC-12, No. 3, pp. 224-231, Jun. 1977, (by E. Vittoz and J. Fellrath).
ESSCIRC 1976 Toulouse "New Analog CMOS IC's based on Weak Inversion Operation", by Eric Vittoz and Jean Fellrath.

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