The art of computer programming, volume 2 (3rd ed.): seminumerical algorithms
The art of computer programming, volume 2 (3rd ed.): seminumerical algorithms
Variable supply-voltage scheme with 95%-efficiency DC-DC converter for MPEG-4 codec
ISLPED '99 Proceedings of the 1999 international symposium on Low power electronics and design
Analysis and Design of Analog Integrated Circuits
Analysis and Design of Analog Integrated Circuits
Single-inductor fuel cell-Li ion charger-supply IC with nested hysteretic control
Analog Integrated Circuits and Signal Processing
A fully integrated switched-capacitor DC-DC converter with dual output for low power application
Proceedings of the great lakes symposium on VLSI
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This paper presents a fully integrated switched-capacitor power converter for self-powered wireless sensor nodes. The design features an efficient step-down charge-pump power stage and a frequency-programmable digital feedback controller. The subthreshold-region design significantly reduces the power dissipation in the controller. Meanwhile, the programmable switching-frequency digital-pulsewidth-modulation control keeps the converter stay at high efficiency, without causing a random noise spectrum. Monolithic implementation effectively suppresses noise and glitches caused by parasitic components due to bonding, packaging, and PCB wiring. Design strategy, system modeling, optimization, and circuit implementation are addressed. An IC prototype was fabricated with a standard 0.35- µm digital CMOS n-well process. It precisely provides a dynamic-voltage-scaling-compatible adjustable power output from 0.8 to 1.5 V and from 400 µW to 7.5 mW. The switching frequency is programmable from 200 kHz to 1 MHz. It achieves 66.7% efficiency with a controller power dissipation of only 147.5 µW.