Voltage-controlled current source

Details Voltage-controlled current source Voltage-controlled current source

2005-06-10

2008-08-26

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S315000

Reexamination Certificate

active

07417415

ABSTRACT:
A voltage-controlled current source (VCCS) is provided. The VCCS controls an output current according to a controlling voltage. The VCCS includes an operational amplifier (OP-amplifier), a transistor, a resistor and a current mirror. The present invention utilizes the characteristics of the OP-amplifier to compensate for the voltage difference between the gate and the source of the transistor so that the resulting terminal voltage on the resistor is equal to the input control voltage. Therefore, the VCCS of the present invention can reduce the factors including process drift, fluctuation in the DC voltage source or the output current that can affect the terminal voltage difference of the resistor and hence the accuracy of the output current.

REFERENCES:
patent: 5021730 (1991-06-01), Smith
patent: 6057727 (2000-05-01), Dautriche et al.
patent: 6700365 (2004-03-01), Isham et al.
patent: 6747508 (2004-06-01), Liu et al.
patent: RE38657 (2004-11-01), Pulvirenti

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