NDLI: 20.3 A feedforward controlled on-chip switched-capacitor voltage regulator delivering 10W in 32nm SOI CMOS

Content Provider	IEEE Xplore Digital Library
Author	Andersen, T.M. Krismer, F. Kolar, J.W. Toifl, T. Menolfi, C. Kull, L. Morf, T. Kossel, M. Brandii, M. Francese, P.A.
Copyright Year	2015
Description	Author affiliation: ETH Zurich, Zürich, Switzerland (Krismer, F.; Kolar, J.W.) \|\| IBM Res., Rüschlikon, Switzerland (Andersen, T.M.; Toifl, T.; Menolfi, C.; Kull, L.; Morf, T.; Kossel, M.; Brandii, M.; Francese, P.A.)
Abstract	On-chip (or fully integrated) switched-capacitor (SC) voltage regulators (SCVR) have recently received a lot of attention due to their ease of monolithic integration. The use of deep trench capacitors can lead to SCVR implementations that simultaneously achieve high efficiency, high power density, and fast response time. For the application of granular power distribution of many-core microprocessor systems, the on-chip SCVR must maintain an output voltage above a certain minimum level Uout, min in order for the microprocessor core to meet setup time requirements. Following a transient load change, the output voltage typically exhibits a droop due to parasitic inductances and resistances in the power distribution network. Therefore, the steady-state output voltage is kept high enough to ensure $V_{OUT}$ >Vout, min at all times, thereby introducing an output voltage overhead that leads to increased system power consumption. The output voltage droop can be reduced by implementing fast regulation and a sufficient amount of on-chip decoupling capacitance. However, a large amount of on-chip decoupling capacitance is needed to significantly reduce the droop, and it becomes impractical to implement owing to the large chip area overhead required. This paper presents a feedforward control scheme that significantly reduces the output voltage droop in the presence of a large input voltage droop following a transient event. This in turn reduces the required output voltage overhead and may lead to significant overall system power savings.
Starting Page	1
Ending Page	3
File Size	837741
Page Count	3
File Format	PDF
ISBN	9781479962235
e-ISBN	9781479962242
DOI	10.1109/ISSCC.2015.7063076
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-02-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	System-on-chip Voltage control Capacitors Feedforward neural networks Temperature measurement Gears Power generation
Content Type	Text
Resource Type	Article

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