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Startup Techniques for 95 mV Step-Up Converter by Capacitor Pass-On Scheme and {\rm V}_{\rm TH} -Tuned Oscillator With Fixed Charge Programming

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9 Author(s)
Po-Hung Chen ; Inst. of Ind. Sci., Univ. of Tokyo, Tokyo, Japan ; Ishida, K. ; Ikeuchi, K. ; Xin Zhang
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This paper presents a 95 mV startup-voltage step-up DC-DC converter for energy harvesting applications. The capacitor pass-on scheme enables operation of the system from an input voltage of 95 mV without using additional off-chip components. To compensate for the die-to-die process variation, post-fabrication threshold voltage (VTH) trimming is applied to reduce the minimum operating voltage (VDDMIN) of the oscillator. Experimental results demonstrate the 34% VDDMIN reduction of the oscillator by post-fabrication VTH trimming. The proposed step-up converter achieves the lowest startup voltage in standard CMOS without using a mechanical switch or large transformer.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 5 )

Date of Publication:

May 2012

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