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J. Low Power Electron. Appl. 2013, 3(3), 250-266; doi:10.3390/jlpea3030250
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Exploration of Charge Recycling DC-DC Conversion Using a Switched Capacitor Regulator

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Received: 6 January 2013; in revised form: 5 July 2013 / Accepted: 9 July 2013 / Published: 29 July 2013
(This article belongs to the Special Issue Selected Papers from SubVt 2012 Conference)
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Abstract: The increasing popularity of DVFS (dynamic voltage frequency scaling) schemes for portable low power applications demands highly efficient on-chip DC-DC converters. The primary aim of this work is to enable increased efficiency of on-chip DC-DC conversion for near-threshold operation of multicore chips. The idea is to supply nominal (high) off-chip voltage to the cores which are then “voltage-stacked” to generate the near-threshold (low) voltages based on Kirchhoff’s voltage law through charge recycling. However, the effectiveness of this implicit down-conversion is affected by the current imbalance among the cores. The paper presents a design methodology and optimization strategy for highly efficient charge recycling on-chip regulation using a push-pull switched capacitor (SC) circuit. A dual-boundary hysteretic feedback control circuit has been designed for stacked loads. A stacked-voltage domain with its self-regulation capability combined with a SC converter has shown average efficiency of 78%–93% for 2:1 down-conversion with ILoad (max) of 200 mA and workload imbalance varying from 0–100%.
Keywords: voltage stacking; charge recycling; DC-DC converter; switched capacitor; energy efficiency; near-threshold; hysteresis feedback; ripple; phase interleaving voltage stacking; charge recycling; DC-DC converter; switched capacitor; energy efficiency; near-threshold; hysteresis feedback; ripple; phase interleaving
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Mazumdar, K.; Stan, M.R. Exploration of Charge Recycling DC-DC Conversion Using a Switched Capacitor Regulator. J. Low Power Electron. Appl. 2013, 3, 250-266.

AMA Style

Mazumdar K, Stan MR. Exploration of Charge Recycling DC-DC Conversion Using a Switched Capacitor Regulator. Journal of Low Power Electronics and Applications. 2013; 3(3):250-266.

Chicago/Turabian Style

Mazumdar, Kaushik; Stan, Mircea R. 2013. "Exploration of Charge Recycling DC-DC Conversion Using a Switched Capacitor Regulator." J. Low Power Electron. Appl. 3, no. 3: 250-266.

J. Low Power Electron. Appl. EISSN 2079-9268 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert