Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1997-05-27
1998-09-01
Berhane, Adolf
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, G05F 326
Patent
active
058015248
ABSTRACT:
A differential input, voltage controlled current source utilizing a low supply voltage and realizing a wide common mode input range. The voltage controlled current source provides a differential output current as a function the differential input voltage which is independent of the common mode input voltage level. The voltage controlled current source includes a first and a second differential amplifier receiving the differential input voltage and producing a differential current having a first and second leg. The first leg of the differential output current is tracked by a current mirror which floats as a function of the bias voltage and common mode input voltage. A second floating current mirror tracks the second differential output current leg. The first and second current mirrors are coupled to a replica bias circuit which is connected in parallel with the differential amplifiers. The replica bias and first and second current mirrors are connected across the supply voltage and not cascaded with other circuit functions, making the present invention compatible with low voltage technologies.
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Berhane Adolf
Carlson Alan L.
Dillon Andrew J.
International Business Machines - Corporation
Salys Casimer K.
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