Level shifter

Details Level shifter Level shifter

2008-03-25

2008-03-25

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000, C326S080000

Reexamination Certificate

active

11376185

ABSTRACT:
In a level shifter, OFF leakage currents flow through two N-type transistors for signal input even when they are OFF. However, another N-type transistor serving as an OFF leakage generation circuit and three P-type transistors serving as current mirrors, which constitute a current conversion circuit, supply to the signal-input transistors a current equivalent to or greater than the OFF leakage currents flowing through the signal-input transistors when they are OFF, thereby canceling the OFF leakage currents. Therefore, one of nodes which is at H level is surely fixed to a potential equal to a higher voltage supply. Thus, the level shifter surely operates with a high speed even when large OFF leakage currents flow through the signal-input transistors.

REFERENCES:
patent: 6417716 (2002-07-01), Riccio
patent: 6445210 (2002-09-01), Nojiri
patent: 6483345 (2002-11-01), Whittaker et al.
patent: 2002/0011873 (2002-01-01), Riccio et al.
patent: 2005/0134355 (2005-06-01), Maede et al.
patent: 2001-298356 (2001-10-01), None
patent: 2002-076881 (2002-03-01), None
patent: 2002-076882 (2002-03-01), None

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