Multi-stage light emitting diode driver circuit

Details Multi-stage light emitting diode driver circuit Multi-stage light emitting diode driver circuit

2007-05-08

2007-05-08

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S087000, C326S027000, C345S082000

Reexamination Certificate

active

11186753

ABSTRACT:
A multi-stage light emitting diode (LED) driver circuit is provided. The circuit includes a driver transistor coupled to an LED. The LED is coupled at a drain of the driver transistor and the driver transistor drives current to the LED. A first transistor stack is coupled between a gate of the driver transistor and ground. A first inverter stage is coupled to a common gate of the first transistor stack. The first inverter stage is further coupled between a high voltage source and ground. A second inverter stage is coupled to a common gate of the first inverter stage. The second inverter stage is further coupled between the high voltage source and ground. The circuit further includes a first transistor coupled between the high voltage source and gate of the driver transistor. The gate of the transistor is coupled to the first inverter stage.

REFERENCES:
patent: 6285573 (2001-09-01), Park
patent: 6803801 (2004-10-01), Randazzo et al.
patent: 2004/0252565 (2004-12-01), Yamazaki et al.
patent: 2005/0093802 (2005-05-01), Yamazaki et al.
Razavi, Behzad, “Design of Analog CMOS Integrated Circuits”, McGraw Hill, 2001, no month.

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