Voltage shifter circuit

Details Voltage shifter circuit Voltage shifter circuit

2008-05-08

2010-02-23

Cho, James (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000

Reexamination Certificate

active

07667490

ABSTRACT:
The present invention provides a voltage shifter circuit, in which a control circuit is used to control the pull-up circuit, so that the pull-up circuit is kept as off when the signal from the input signal source changes from a low voltage to a high voltage. Hence, the competition between the pull-up circuit and the pull-down circuit is avoided. The speed of the voltage shifter circuit is improved and the voltage shifter circuit can operate within a wider voltage range. The delay time of the pull-up circuit and the pull-down circuit is small and the duty cycle is small. In addition, since no direct current path is established, no current is wasted. Additionally, the voltage shifter circuit uses the second delayer to compensate the delay time between the pull-up circuit and the pull-down circuit and optimizes the duty cycle.

REFERENCES:
patent: 6097216 (2000-08-01), Youn
patent: 6768367 (2004-07-01), Meadows et al.
patent: 2006/0061386 (2006-03-01), Kanzaki

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