Low-Power Clock Reference Circuit for Intermittent Operation of Subthreshold LSIs Ken Ueno, Tetsuya Asai, and Yoshihito Amemiya Department of Electrical Engineering, Hokkaido University, Sapporo 060-0814 Japan Tel: +81-11-706-7149, Fax: +81-11-706-7890 E-mail: k
[email protected]
Abstract— A low power on-chip reference clock generator consisting of subthreshold MOSFET circuits is proposed. It uses a simple frequency-locked loop technique with no inductor, quartz resonator, or MEMS oscillator. Theoretical analyses and a SPICE simulation with 0.35-µm CMOS parameters showed that the clock frequency could be controlled in the frequency range of 10-1000 kHz. When operated at 170 kHz, the generator showed a temperature coefficient of 100 ppm/˚C, a line sensitivity of 3%/V, and a power consumption of 20 µW. Our clock generator can be used as a reference clock for intermittent operation in power aware LSIs.
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