High speed level shifter

Details High speed level shifter High speed level shifter

2007-08-23

2009-10-27

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000, C327S333000

Reexamination Certificate

active

07609090

ABSTRACT:
Embodiments of the present invention provide level shifter circuits capable of high frequency operations. The level shifter circuit utilizes a dynamic charge injection device, which diminishes a capacitive coupling effect between a gate and a drain of input NMOS devices, when the input signal switches from a high logic level to a low logic level. The dynamic charge injection device is incorporated at output nodes to provide initial thrust to the level shifter circuits, which triggers a positive regenerative feedback of cross-coupled pull up PMOS devices enabling a rapid transition and hence the high frequency operation.

REFERENCES:
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patent: 5995010 (1999-11-01), Blake et al.
patent: 6005413 (1999-12-01), Schmitt
patent: 6487687 (2002-11-01), Blake et al.
patent: 6700429 (2004-03-01), Kanno et al.
patent: 6864718 (2005-03-01), Yu
patent: 6963226 (2005-11-01), Chiang
patent: 7071730 (2006-07-01), Cordoba
patent: 7200053 (2007-04-01), Kim et al.
patent: 7310012 (2007-12-01), Chen

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