A microwatt switched-capacitor voltage doubler-based voltage regulator for ultra-low power energy harvesting systems

Jarno Salomaa; Mika Pulkkinen; Kari Halonen

doi:10.1007/s10470-016-0708-2

A microwatt switched-capacitor voltage doubler-based voltage regulator for ultra-low power energy harvesting systems

Jarno Salomaa^*, Mika Pulkkinen, Kari Halonen

^*Corresponding author for this work

Kari Halonen Group

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Abstract

This paper presents an SC voltage doubler-based voltage regulator for ultra-low power energy harvesting applications. It produces a stable 1.2-V power supply, using inputs from 0.63 to 1.8 V. External compensation and an on-chip output capacitor ensure good performance even with zero load current and any load capacitance. The regulator tolerates arbitrary input ramp-ups, and is immune to blackout and brownout. A stability analysis for the regulator control loop is presented. The regulator ASIC is implemented in a 180 nm CMOS process. The measured regulator peak power and current efficiency are 63 and 49 %, respectively. The performance has been characterized with load currents from zero to (Formula presented.)A.

Original language	English
Pages (from-to)	347–358
Number of pages	12
Journal	Analog Integrated Circuits and Signal Processing
Volume	88
Issue number	2
DOIs	https://doi.org/10.1007/s10470-016-0708-2
Publication status	Published - Aug 2016
MoE publication type	A1 Journal article-refereed

Keywords

Brownout
Energy harvesting
SC voltage converter
Start-up
Ultra-low power
Voltage regulator

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AB - This paper presents an SC voltage doubler-based voltage regulator for ultra-low power energy harvesting applications. It produces a stable 1.2-V power supply, using inputs from 0.63 to 1.8 V. External compensation and an on-chip output capacitor ensure good performance even with zero load current and any load capacitance. The regulator tolerates arbitrary input ramp-ups, and is immune to blackout and brownout. A stability analysis for the regulator control loop is presented. The regulator ASIC is implemented in a 180 nm CMOS process. The measured regulator peak power and current efficiency are 63 and 49 %, respectively. The performance has been characterized with load currents from zero to (Formula presented.)A.

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KW - SC voltage converter

KW - Start-up

KW - Ultra-low power

KW - Voltage regulator

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A microwatt switched-capacitor voltage doubler-based voltage regulator for ultra-low power energy harvesting systems

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