ISLPED-Niemier-2007 - Clocking Structures and Power...

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Unformatted text preview: Clocking Structures and Power Analysis for Nanomagnet-Based Logic Devices M.T. Niemier, X.S. Hu University of Notre Dame Dept. of Comp. Sci. & Eng. Notre Dame, IN 46556 mniemier, M. Alam, G. Bernstein, W. Porod University of Notre Dame Dept. of Elec. Eng. Notre Dame, IN 46556 malam1, gbernste, M. Putney, J. DeAngelis University of Notre Dame Dept. of Comp. Sci. & Eng. Notre Dame, IN 46556 mputney1, ABSTRACT Logical devices made from nano-scale magnets have many po- tential advantages systems should be non-volatile, dense, low power, radiation hard, and could have a natural interface to MRAM. Initial work includes experimental demonstrations of logic gates and wires and theoretical studies that consider their power dissipation. This paper looks at power dissipa- tion too, but also considers the circuitry needed to drive a computation. Initial results are very encouraging and indi- cate that clocked magnetic logic could in the worst case match equivalent low power CMOS circuits and in the best- case potentially provide more than 2 orders of magnitude improvement when one considers energy per operation. Categories and Subject Descriptors B.8.2 [ Hardware ]: Performance and Reliability Performance Analysis and Design Aids General Terms Performance Keywords Clocking, Magnetic Logic, Nanotechnology, QCA 1. INTRODUCTION Magnetic logic based on coupled ferrite cores was originally pursued in the 1950s, but was eventually replaced by semi- conductor chips. The lithographically-defined nanomagnets that form the basis of this work (i) do not possess the disad- vantages of the early, bulky, ferrite core magnets, and (ii) can be arranged to form circuits within the quantum-dot cellular automata (QCA) architecture scheme [11]. For nanomagnet- based QCA (MQCA), wires, gates, and inverters made from nanomagnets have all been experimentally realized and veri- fied [11], they operate at room temperature [3], and if 10 10 of these nanomagnets switch 10 8 times each second, the magnets would only dissipate about 0.1 W of power [6]. That said, more than just magnets are required for com- putation. A clock structure capable of generating an exter- nal magnetic field is also needed to drive the computation. Clocking removes remanent magnetizations from previous logical operations, and allows devices to be re-used to eval- uate new input combinations. Essentially, a magnetic field Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for pro / t or commercial advantage and that copies bear this notice and the full citation on the / rst page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior speci / c permission and/or a fee....
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ISLPED-Niemier-2007 - Clocking Structures and Power...

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