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

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

554

Lastpage

557

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISPACS.2006.364719

Filename

4212337