Digitally controlled precision current source with an open loop

Details Digitally controlled precision current source with an open loop Digitally controlled precision current source with an open loop

1982-04-05

1984-07-03

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323314, 323354, 340347DA, G05F 320, G05F 158

Patent

active

044582013

ABSTRACT:
A precision current source includes a current source transistor and a current steering circuit which selectively directs the output current from the current source transistor through either a first or a second current path in response to a digital input signal. A compensation circuit directs a highly accurate steady state current through first and second series coupled compensation transistors. The base of the second compensation transistor is coupled to the base of the current source transistor. The compensation circuit operates to control the voltage differential between the base of the current source transistor and a voltage source to maintain the output current intermittently steered through the second current path precisely constant regardless of changes in the beta of the current switching transistor or changes in the beta or base to emitter voltage of the current source transistor.

REFERENCES:
patent: 3721893 (1973-03-01), Davis
patent: 3731181 (1973-05-01), Cecil et al.
patent: 3961326 (1976-06-01), Craven
patent: 4056740 (1977-11-01), Schoeff
patent: 4400690 (1983-08-01), Brokaw et al.

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