An Ultra-Low Voltage Level Shifter Using Revised Wilson Current Mirror for Fast and Energy-Efficient Wide-Range Voltage Conversion from Sub-Threshold to I/O Voltage

An Ultra-Low Voltage Level Shifter Using Revised Wilson Current Mirror for Fast and Energy-Efficient Wide-Range Voltage Conversion from Sub-Threshold to I/O Voltage
Title:
An Ultra-Low Voltage Level Shifter Using Revised Wilson Current Mirror for Fast and Energy-Efficient Wide-Range Voltage Conversion from Sub-Threshold to I/O Voltage
Other Titles:
Circuits and Systems I: Regular Papers, IEEE Transactions on
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Publication Date:
01 March 2015
Citation:
Jun Zhou; Chao Wang; Xin Liu; Xin Zhang; Minkyu Je, "An Ultra-Low Voltage Level Shifter Using Revised Wilson Current Mirror for Fast and Energy-Efficient Wide-Range Voltage Conversion from Sub-Threshold to I/O Voltage," Circuits and Systems I: Regular Papers, IEEE Transactions on , vol.62, no.3, pp.697,706, March 2015 doi: 10.1109/TCSI.2014.2380691
Abstract:
This paper presents a novel ultra-low voltage level shifter for fast and energy-efficient wide-range voltage conversion from sub-threshold to I/O voltage. By addressing the voltage drop and non-optimal feedback control in a state-of-the-art level shifter based on Wilson current mirror, the proposed level shifter with revised Wilson current mirror significantly improves the delay and power consumption while achieving a wide voltage conversion range. It also employs mixed-Vt device and device sizing aware of inverse narrow width effect to further improve the delay and power consumption. Measurement results at 0.18 show that compared with the Wilson current mirror based level shifter, the proposed level shifter improves the delay, switching energy and leakage power by up to respectively, when converting 0.3 V to a voltage between 0.6 V and 3.3 V. More specifically, it achieves 1.03 (or 1.15) FO4 delay, 39 (or 954) fJ/transition and 160 (or 970) pW leakage power, when converting 0.3 V to 1.8 V (or 3.3 V), which is better than several state-of-the-art level shifters for similar range voltage conversion. The measurement results also show that the proposed level shifter has good delay scalability with supply voltage scaling and low sensitivity to process and temperature variations.
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PublisherCopyrights
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(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
ISSN:
1549-8328
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