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a balanced hybrid architecture containing both customized and programmable units, and appropriate<br />

circuits supporting such architectural choices. The DSP consumes 220 nW at 1 V, 1.2 kHz and includes<br />

embedded support for harvesting energy from ambient sources. Simon [37] has demonstrated a lowpower<br />

single chip video encoder with embedded dynamic memory. The compression is performed using<br />

wavelet filtering and a combination of zero-tree and arithmetic coding of filter coefficients. Hooks for<br />

motion estimation are also provided. The chip dissipates on the order of 0.5 mW while compressing an<br />

8-bit gray scale 30 frames/sec, 128 × 128 video stream. Goodman [38] built a programmable reconfigurable<br />

public key processor that demonstrated 2–3 orders of magnitude of power reduction compared<br />

to software and programmable-logic based implementations while providing similar flexibility and freedom<br />

in algorithm selection. Finally, Mosch et al. [39] have demonstrated a DSP for a hearing aid chipset<br />

featuring 77 MOPS/mW. Algorithmic and architectural optimizations were heavily employed to achieve<br />

such a result.<br />

References<br />

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past, present and future. IEEE Communications Magazine, 38(1), Jan. 2000, pp. 84–90.<br />

2. R. Min et al. Low-power wireless sensor networks. In Proceedings of the Fourteenth International<br />

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14. L. Nielsen et al. Low-power operation using self-timed circuits and adaptive scaling of the supply<br />

voltage. IEEE Transactions on VLSI Systems, Dec. 1994, pp. 391–397.<br />

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of the 1996 International Symposium on Low Power Electronics and Design, Aug. 1996, pp. 313–318.<br />

16. V. Gutnik, A. Chandrakasan. Embedded power supply for low-power DSP. IEEE Transactions on<br />

VLSI Systems, Dec. 1997, pp. 425–435.<br />

17. J. Goodman, A. Dancy, A. Chandrakasan. An energy/security scalable encryption processor using<br />

an embedded variable voltage DC/DC converter. IEEE Journal of Solid-State Circuits, 33(11), Nov.<br />

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© 2002 by CRC Press LLC

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