AITR-1500

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AITR-1500

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec

AITR-1500 chnology (1986) M.S. Electrical Engineering anil Computer Science. Massachusetts Institute of Technology (1989)Submitted to the Department of Electric

al Engineering and Computer Science in partial fulfillment of the requirements for the degree ofDoctor of Philosophyat theMASSACHUSETTS INS I TI I I E AITR-1500

OF TECHNOLOGY33390© Massachusetts Instit ute of Technology I99IThesis Supervisor: Thomas F. Knight. Jr.MASS\( lirsr. l TS INSTITUTE OF TECHNOLOGY ART

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IFICIAL INTELLIGENCE LABORATORYA.l. technical Report No. 1500.lune, 1991Asymptotically- Zero Energy Computing Using Split-Level Charge Recovery LogicS

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec

AITR-1500 information systems ami large computers. In this work we present a number of new CMOS logic families, Charge Recovery Logic (CRI.) as well as the muc

h improved Split-Level Charge Recovery Logic (SCRL), within which the transfer of charge between the nodes occurs quasistatically. Operating quasistat AITR-1500

ically. those logic families have an energy dissipation that drops linearly with operating frequency, ».e., their power consumption drops quadraticall

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y with operating frequency as opposed to the linear drop of conventional CMOS. '1 he circuit techniques in these new families rely on constructing an

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec

AITR-1500 logical inverse. Information necessary to uncompute the inverse is available from the subsequent inverse logic stage. We demonstrate the low energy o

peration of SCRL by presenting the results from the testing of the first fully qnasistatic 8x8 multiplier chip (SCRL-I) employing SCR I. circuit techn AITR-1500

iques.Acknowledgements: I llis repeat describes research dune at the Artificial Intelligence Laboratory of the Massachusetts Institute uf Technology.

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Support for the Laboratory's Artificial Intelligence Research ts provided in pari by the Advanced Research Projects Agency under Office of Naval Resea

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec

AITR-1500 ient of the following adviceof course yon can do it that way, hilt if Ỉ was doing it I would...”and many a times I went my own way. On reflection. I w

ish that for the most part, I had not. When it comes to technical intuition of the kind that usually turns out to be true, Tom Knight seems to have an AITR-1500

enviable supply. I’m thankful for having worked with him technically and grateful for having known him personally.Iwish to thank Gregory Papodopoulos

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and Kim Molvjg for their commitment and support of this work.I would also like to thank members of toms-knights group including Sir Philip Alvclda, S

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec

AITR-1500 ostanza for their generosity, and friendship during the testing of SCRI.-l chip and throughout my hacking days at MIT.Illis research is supported in p

art by the Defense Advanced Research Projects Agency under contract1698 and DAB Ì63-92-C-0039ContentsIIntroduction and Background11Introduction21.1New AITR-1500

Ideas. Old Physics .................................................. 21.2Quasistatic Switching ................................................... 2

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1.3What is Reversible Logic................................................ -I1.4Temporal Reversibility...............................................

Asymptotically Zero Energy Computing UsingSplit-Level Charge Recovery LogicbySaed G. YounisS.B. Electrical Engineering. Massachusetts Institute oi Tec