Constant current circuit and light emitting diode drive circuit

Details Constant current circuit and light emitting diode drive circuit Constant current circuit and light emitting diode drive circuit

2008-03-12

2009-08-18

Vu, David Hung (Department: 2821)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S132000, C327S333000

Reexamination Certificate

active

07576574

ABSTRACT:
A constant current generator which includes a first transistor to supply current in accordance with a control signal, a second transistor that is a MOS transistor having an equal impurity type to the first transistor. To supply current to a load in accordance with the control signal, a gate and source of the second transistor are connected to a gate and source of the first transistor, respectively. Also, there is a voltage adjustor to adjust drain voltage of the first transistor in accordance with drain voltage of the second transistor, a constant current generation circuit including a first current source to supply first current to the first transistor through the voltage adjustor, and a level shifter to shift a voltage at a connection node of the voltage adjustor and the constant current generation circuit, output a shifted voltage to each gate of the first and second transistors.

REFERENCES:
patent: 5894236 (1999-04-01), Mizoguchi et al.
patent: 6724235 (2004-04-01), Costa et al.
patent: 7161412 (2007-01-01), Manganaro
patent: 2005/0068066 (2005-03-01), Yamashita et al.
patent: 2007/0108958 (2007-05-01), Minakuchi
patent: 9-319323 (1997-12-01), None
patent: 2004-180007 (2004-06-01), None

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