Regulated constant current circuit

Details Regulated constant current circuit Regulated constant current circuit

1977-04-25

1978-11-28

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307251, 307230, 323 9, H03K 1700

Patent

active

041277830

ABSTRACT:
A CMOS regulated constant current circuit includes a first reference circuit producing a reference voltage applied to one input of an operational amplifier. The output of the operational amplifier is connected to the gate electrode of a reference field effect transistor having its source connected to ground and its drain connected to the other input of the operational amplifier and to one terminal of a control resistor, the other terminal of the reference field effect transistor being coupled to a plurality of CMOS transmission gates. Each of the CMOS transmission gates can controllably be switched on independently in order to apply the operational amplifier output voltage to a respective one of a plurality of output field effect transistors of the same conductivity type as the reference field effect transistor and each having its source connected to ground. The drains of the output field effect transistors can then be utilized to provide switchable constant currents which can be utilized, for example, to drive light-emitting diodes. The output currents are essentially independent of CMOS manufacturing processing parameters.

REFERENCES:
patent: 3536988 (1970-10-01), Boynton
patent: 3870906 (1975-03-01), Hughes
patent: 3909715 (1975-09-01), Oda

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