Variable output-type constant current source circuit

Details Variable output-type constant current source circuit Variable output-type constant current source circuit

2006-06-06

2006-06-06

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07057448

ABSTRACT:
Disclosed is a variable output-type constant current source circuit capable of varying its output current in a stepwise manner without the complication in circuit configuration and the increase in size of a semiconductor circuit board for incorporating the circuit therein. The constant current source circuit comprises a first self-biasing type constant current circuit3aconfigured such that transistors M1, M2are operable to cooperatively supply a given voltage across a resistor RS to generate a stabilized current IR1. In order to vary the output current, the constant current source circuit includes a switching circuit5(transistor M5) connected in series to a series circuit connecting in series the transistor M1and the resistor RS, and a second constant current circuit4connected in parallel to a series circuit connecting in series the transistor M1, the resistor RS and the transistor M5. The second constant current circuit4is also configured to serve as an activation circuit for the first constant current circuit3a.

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