Level shifter circuit

Details Level shifter circuit Level shifter circuit

2002-09-26

2010-10-19

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C326S080000, C326S081000

Reexamination Certificate

active

07816969

ABSTRACT:
A level shifter circuit is disclosed. The circuit receives a digital input signal characterized by a logical high state having a first high voltage level and generates an output node for driving a digital output signal characterized by a logical high state having a second high voltage level. The output signal logical state mirrors the input signal logical state. The circuit includes a short circuit current reduction mechanism for charging a first internal node of level shifter circuit following a first transition of the input signal logical state. The circuit further includes a performance enhancement mechanism for discharging the first internal node of the level shifter circuit following a second transition of the input signal logical state. The performance enhancement mechanism may comprise a transistor driven by the input signal and connected between the first internal node and ground. The current limiting mechanism may comprise a transistor having a source/drain terminal connected to the first internal node.

REFERENCES:
patent: 5493245 (1996-02-01), Kao et al.
patent: 5502406 (1996-03-01), Traynor et al.
patent: 6002290 (1999-12-01), Avery et al.
patent: 6259299 (2001-07-01), Ryu

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