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Energy Efficient Bootstrapped CMOS Large RC-Load Driver Circuit for Ultra Low-Voltage VLSI
Department of Electronics Engineering & Institute of Electronics, National Chiao Tung University, Hsinchu 30050, Taiwan
* Authors to whom correspondence should be addressed.
Received: 21 October 2012; in revised form: 5 December 2012 / Accepted: 5 December 2012 / Published: 12 December 2012
Abstract: This paper presents an energy efficient bootstrapped CMOS driver to enhance the switching speed for driving large RC load for ultra-low-voltage CMOS VLSI. The proposed bootstrapped driver eliminates the leakage paths in the conventional bootstrapped driver to achieve and maintain more positive and negative boosted voltage levels of the boosted nodes, thus improving boosting efficiency and enhancing driver switching speed. Measured performance from test chips implemented with UMC 65 nm low-power CMOS technology (VTN ≈ VTP ≈ 0.5 V) indicates that the proposed driver provides a rising-delay improvement of 37%–50% and a falling-delay improvement of 25%–47% at 0.3 V for a loading ranging from a 0 to 24 mm long M6 metal line compared with the conventional bootstrapped driver. Although designed and optimized for subthreshold ultra low-voltage operation, the proposed bootstrapped driver is shown to be advantageous at higher nearly-threshold supply voltage as well. The proposed driver provides a rising delay improvement of 20% to 52% and a falling delay improvement of 23%–43% for VDD ranging from 0.3 V to 0.5 V, while consuming about 15% less average power than the conventional bootstrapped driver driving a 16 mm long M6 wire.
Keywords: low-voltage; CMOS driver; bootstrapped driver; sub-threshold driver
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MDPI and ACS Style
Lu, C.-Y.; Chuang, C.-T. Energy Efficient Bootstrapped CMOS Large RC-Load Driver Circuit for Ultra Low-Voltage VLSI. J. Low Power Electron. Appl. 2012, 2, 282-300.
Lu C-Y, Chuang C-T. Energy Efficient Bootstrapped CMOS Large RC-Load Driver Circuit for Ultra Low-Voltage VLSI. Journal of Low Power Electronics and Applications. 2012; 2(4):282-300.
Lu, Chien-Yu; Chuang, Ching-Te. 2012. "Energy Efficient Bootstrapped CMOS Large RC-Load Driver Circuit for Ultra Low-Voltage VLSI." J. Low Power Electron. Appl. 2, no. 4: 282-300.