Title :
Power Supply Circuits for Ultralow-Power Subthreshold CMOS Smart Sensor LSIs
Author :
Hirose, Tetsuya ; Asai, Tetsuya ; Amemiya, Yoshihito
Author_Institution :
Dept. of Electr. Eng., Hokkaido Univ., Sapporo
Abstract :
A low-voltage power supply circuit was developed for micropower CMOS LSI applications, with microwatt smart- sensor LSIs being the specific focus. The circuit consists of a switched-capacitor voltage converter and a series regulator. The switched converter lowers battery voltage by 1.5-3 V to a low voltage of 0.5-0.7 V that drives the series regulator, and the series regulator provides LSI logic gates with a power voltage of 0.4- 0.6 V such that the logic gates operate at a subthreshold region. The switched converter lowered the voltage of a 1.5-V battery to 0.68 V in a sample circuit designed to produce a supply voltage of 0.6 V, and the series regulator lowered it further to 0.6 V. The power efficiency of the switched converter is 83 %, and the total efficiency is 73 % with a 13-muA output current.
Keywords :
CMOS logic circuits; intelligent sensors; large scale integration; logic gates; low-power electronics; power supply circuits; switched capacitor networks; LSI logic gates; current 13 muA; low-voltage power supply circuit; micropower CMOS LSI applications; series regulator; switched-capacitor voltage converter; ultralow-power subthreshold CMOS smart sensor; voltage 0.4 V to 0.6 V; voltage 0.5 V to 0.7 V; voltage 1.5 V; Batteries; Capacitors; DC-DC power converters; Intelligent sensors; Large scale integration; Power supplies; Regulators; Switching circuits; Switching converters; Voltage;
Conference_Titel :
Intelligent Signal Processing and Communications, 2006. ISPACS '06. International Symposium on
Conference_Location :
Tottori
Print_ISBN :
0-7803-9732-0
Electronic_ISBN :
0-7803-9733-9
DOI :
10.1109/ISPACS.2006.364719
