Level shifter

Details Level shifter Level shifter

2007-10-16

2008-11-04

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Interface

Logic level shifting

C327S333000

Reexamination Certificate

active

07446566

ABSTRACT:
A level shifter circuit includes first and second cross-coupled P channel transistors, first and second cross-coupled N channel transistors, and first and second inverters. The first and second P channel transistors are coupled to receive a first power supply voltage. The first and second cross-coupled N channel transistors are coupled to the first and second P channel transistors. The first and second inverters are coupled to the first and second N channel transistors and are coupled to receive a second power supply voltage that is lower than the first power supply voltage. The first and second N channel transistors have a lower, substantially zero volts, threshold voltage and can be controlled by a low voltage signal while limiting a leakage current.

REFERENCES:
patent: 4486670 (1984-12-01), Chan et al.
patent: 5321324 (1994-06-01), Hardee et al.
patent: 5781026 (1998-07-01), Chow
patent: 6556061 (2003-04-01), Chen et al.
patent: 6791391 (2004-09-01), Nishimura et al.
patent: 7053656 (2006-05-01), Seo
patent: 7176740 (2007-02-01), Tachibana et al.

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