High impedance current source

Details High impedance current source High impedance current source

1984-03-30

1986-03-04

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323315, G05F 326

Patent

active

045742332

ABSTRACT:
A current source circuit includes a first transistor (11) having an output current which is sensed across a resistance connected between the emitter of the first transistor (11) and the negative side of the supply voltage. A series negative feedback loop comprising transistors (13, 15) is connected between the emitter of first transistor (11) and the base of first transistor (11). The transistors (11, 13 and 15) and the other circuit components are selected so as to result in an incremental output resistance approaching that of a cascode current source, while having a voltage drop across the circuit of substantially less than 1 volt.

REFERENCES:
patent: 3962592 (1976-06-01), Thommen et al.
patent: 4037120 (1977-07-01), Colardelle et al.
patent: 4435678 (1984-03-01), Joseph et al.
Vojnovic, "Accurate Voltage-Controlled Constant Current Source", New Electron, (G.B.), vol. 11, No. 4, p. 23, Feb. 21, 1978.

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