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

Maojiao He; Michael P. Frank; Huikai Xie

doi:10.1117/12.582184

28 February 2005 CMOS-MEMS resonator as a signal generator for fully-adiabatic logic circuits

Maojiao He, Michael P. Frank, Huikai Xie

Proceedings Volume 5649, Smart Structures, Devices, and Systems II; (2005) https://doi.org/10.1117/12.582184
Event: Smart Materials, Nano-, and Micro-Smart Systems, 2004, Sydney, Australia

Abstract

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.

Citation Download Citation

Maojiao He, Michael P. Frank, and Huikai Xie "CMOS-MEMS resonator as a signal generator for fully-adiabatic logic circuits", Proc. SPIE 5649, Smart Structures, Devices, and Systems II, (28 February 2005); https://doi.org/10.1117/12.582184

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available