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Embedded Power Supply for Low-
消耗积分:2 |
格式:rar |
大小:201 |
2010-07-09
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Abstract—Theuseofdynamicallyadjustablepowersuppliesas
amethodtolowerpowerdissipationinDSPisanalyzed.Power
canbereducedsubstantiallywithoutsacrificingperformancein
fixed-throughputapplicationsbyslowingtheclockandlowering
supplyvoltageinsteadofidlingwhencomputationalworkload
varies.Thiscanyieldatypicalpowersavingsof30–50%.If
latencycanbetolerated,bufferingdataandaveragingprocessing
ratecanyieldpowerreductionsof anorderofmagnitude insome
applications.Continuousvariationofthesupplyvoltagecanbe
approximatedbyverycrudequantizationanddithering:afour-
levelcontrollerissufficienttogetwithinafewpercentofthe
optimalpowersavings.Significantsavingsarepossibleonlyifthe
voltagecanbechangedonthesametimescaleasthevariations
inworkload.Achiphasbeenfabricatedandtestedtoverify
theclosed-loopfunctionalityofavariablevoltagesystem.The
controllertakesonly0.4mm2
anddrawsamaximumof1mW
at2Vwitha40MHzclock.Thecontrolframeworkdeveloped
isapplicabletogenericDSPapplications.
IndexTerms—Low-powerDSP,variablesupplyvoltage,work-
loadaveraging.
amethodtolowerpowerdissipationinDSPisanalyzed.Power
canbereducedsubstantiallywithoutsacrificingperformancein
fixed-throughputapplicationsbyslowingtheclockandlowering
supplyvoltageinsteadofidlingwhencomputationalworkload
varies.Thiscanyieldatypicalpowersavingsof30–50%.If
latencycanbetolerated,bufferingdataandaveragingprocessing
ratecanyieldpowerreductionsof anorderofmagnitude insome
applications.Continuousvariationofthesupplyvoltagecanbe
approximatedbyverycrudequantizationanddithering:afour-
levelcontrollerissufficienttogetwithinafewpercentofthe
optimalpowersavings.Significantsavingsarepossibleonlyifthe
voltagecanbechangedonthesametimescaleasthevariations
inworkload.Achiphasbeenfabricatedandtestedtoverify
theclosed-loopfunctionalityofavariablevoltagesystem.The
controllertakesonly0.4mm2
anddrawsamaximumof1mW
at2Vwitha40MHzclock.Thecontrolframeworkdeveloped
isapplicabletogenericDSPapplications.
IndexTerms—Low-powerDSP,variablesupplyvoltage,work-
loadaveraging.
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