CUED Publications database

Energy recycling from multigigahertz clocks using fully integrated switching converters

Sheikhaei, S and Alimadadi, M and Lemieux, GGF and Mirabbasi, S and Dunford, WG and Palmer, PR (2013) Energy recycling from multigigahertz clocks using fully integrated switching converters. IEEE Transactions on Power Electronics, 28. pp. 4227-4239. ISSN 0885-8993

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Abstract

Large digital chips use a significant amount of energy to broadcast a low-skew, multigigahertz clock to millions of latches located throughout the chip. Every clock cycle, the large aggregate capacitance of the clock network is charged from the supply and then discharged to ground. Instead of wasting this stored energy, it is possible to recycle the energy by controlling its delivery to another part of the chip using an on-chip dc-dc converter. The clock driver and switching converter circuits share many compatible characteristics that allow them to be merged into a single design and fully integrated on-chip. Our buck converter prototype, manufactured in 90-nm CMOS, provides a proof-of-concept that clock network energy can be recycled to other parts of the chip, thus lowering overall energy consumption. It also confirms that monolithic multigigahertz switching converters utilizing zero-voltage switching can be implemented in deep-submicrometer CMOS. With multigigahertz operation, fully integrated inductors and capacitors use a small amount of chip area with low losses. Combining the clock driver with the power converter can share the large MOSFET drivers necessary as well as being energy and space efficient. We present an analysis of the losses which we confirm by experimentally comparing the merged circuit with a conventional clock driver. © 2012 IEEE.

Item Type: Article
Uncontrolled Keywords: Charge recycling energy recovery energy recycling integrated clock/converter integrated dc-dc converter integrated output filter multigigahertz clock switching dc-dc converter
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 08 Dec 2014 02:21
DOI: 10.1109/TPEL.2012.2237041