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Fast-Delay and Low-Power Level Shifter for Low-Voltage Applications
O-Sam KWON Kyeong-Sik MIN
IEICE TRANSACTIONS on Electronics
Publication Date: 2007/07/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
level shifter, low power, high speed, dynamic voltage scaling, low voltage,
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A new level shifter is proposed in this paper that mitigates the contention problem between its pull-up and pull-down switches without suffering the delay penalty. Comparing this new one with two conventional shifters (CLS-1 and CLS-2) indicates that CLS-1 and CLS-2 have the delay times which are 308% and 26% slower than the proposed shifter when VDDL/VDDH=0.3 and the fan-out=2, respectively. In addition, the comparison of power-delay products shows CLS-2 consumes 28.5% more energy than the proposed shifter. For the layout area, the proposed shifter needs only 15% more than CLS-2. By comparing the propagation delay times, the power-delay products, and the area overhead, the proposed shifter is considered very suitable to future Very Deep Sub-Micron (VDSM) technologies with low-voltage applications.