Current source having a wide range of output voltages

Details Current source having a wide range of output voltages Current source having a wide range of output voltages

1989-02-23

1990-02-13

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 330311, G05F 326

Patent

active

049010026

ABSTRACT:
A current source having a wide range of output voltages. The emitter-collector path of a main transistor (T.sub.30) of the npn type, arranged to define the value of the current, is connected in series with the collector-emitter paths of a plurality of cascaded npn-type output transistors (T.sub.31 . . . T.sub.35). Each output transistor (T.sub.31 . . . T.sub.35) is associated with a respective control transistor (T'.sub.31 . . . T'.sub.35) of the opposite type. At least some of the control transistors have their emitters connected to respective collectors of output transistors of a different rank. This yields an output voltage V.sub.s which can range between small values and a value close to the supply voltage V.sub.c.

REFERENCES:
patent: 2888525 (1959-05-01), Eckess et al.
patent: 3940683 (1976-02-01), Blauschild
patent: 4166971 (1979-09-01), Schneider

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