Light emitting device and current mirror thereof

Details Light emitting device and current mirror thereof Light emitting device and current mirror thereof

2007-01-25

2008-12-09

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S427000, C323S316000

Reexamination Certificate

active

07463082

ABSTRACT:
A current mirror has a first transistor and a second transistor. Current through the first and second transistors are an input current and an output current, respectively. The ratio of the output current to the input current is constant. The first and second transistors have the same voltage difference between the gate and source. The voltage difference between the drain and source of the second transistor is equalized to that of the first transistor by a first operational amplifier, and the voltage difference between the drain and source of the first transistor is equalized to a control voltage by a second operational amplifier. By setting the value of the control voltage, the first and second transistors can operate in triode region to simultaneously provide high output current and sufficient potential for a load.

REFERENCES:
patent: 5847556 (1998-12-01), Kothandaraman et al.
patent: 6433528 (2002-08-01), Bonelli et al.
patent: 6798182 (2004-09-01), Charlon
patent: 2007/0008255 (2007-01-01), Emek et al.

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