CMOS-MEMS resonator as a signal generator for fully-adiabatic logic circuits

Maojiao He*, Michael P. Frank, Huikai Xie

*此作品的通讯作者

科研成果: 期刊稿件会议文章同行评审

2 引用 (Scopus)

摘要

Fully-adiabatic (thermodynamically reversible) logic is one of the few promising approaches to low-power logic design. To maximize the system power-performance of an adiabatic circuit requires an ultra low-loss on-chip clock source, which can generate an output signal with a quasi-trapezoidal (flat-topped) voltage waveform. In this paper, we propose to use high-Q MEMS resonators to generate the custom waveform. The big challenge in the MEMS resonator design is that a non-sinusoidal (quasi-trapezoidal) waveform needs to be generated even though the resonator oscillates sinusoidally. Our solution is to customize the shape of the sensing comb fingers of the resonator, with the result that the sensing capacitance varies quasi-trapezoidally. The effective quality factor and the area-efficiency of the microstructure have been optimized so as to minimize the whole system's power dissipation and cost at a given frequency. A resonator design with a 100 kHz resonant frequency based on a standard TSMC 0.35μm CMOS process has been fabricated. The resonator has an area of 300 μm by 160 μm with a thickness of 30 μm. Three-dimensional field simulation shows that the resonator generates a quasi-trapezoidal waveform when it operates at its resonance. An on-chip buffer is also designed for monitoring the waveform generated by the MEMS resonator. The post-CMOS fabrication process is compatible with standard CMOS processes. Thus the custom clock generator can be integrated with logic circuits on the same CMOS chip. The size of the MEMS resonator can be further reduced by design optimization and advances in micro/nano-fabrication technology.

源语言英语
文章编号18
页(从-至)126-136
页数11
期刊Proceedings of SPIE - The International Society for Optical Engineering
5649
PART 1
DOI
出版状态已出版 - 2005
已对外发布
活动Smart Structures, Devices, and Systems II - Sydney, 澳大利亚
期限: 13 12月 200415 12月 2004

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