A 5.8nW, 45ppm/°C on-chip CMOS wake-up timer using a constant charge subtraction scheme

Author

Seokhyeon Jeong ; Inhee Lee ; Blaauw, D. ; Sylvester, Dennis

Author_Institution

Univ. of Michigan, Ann Arbor, MI, USA

fYear

2014

fDate

15-17 Sept. 2014

Firstpage

1

Lastpage

4

Abstract

This work presents an ultra-low power oscillator designed for wake-up timers in compact wireless sensors. A constant charge subtraction scheme removes continuous comparator delay from the oscillation period, which is the source of temperature dependence in conventional RC relaxation oscillators. This relaxes comparator design constraints, enabling low power operation. In 0.18μm CMOS, the oscillator consumes 5.8nW at room temperature with temperature stability of 45ppm/°C (-10°C to 90°C) and 1%V line sensitivity.

Keywords

CMOS integrated circuits; RC circuits; integrated circuit design; low-power electronics; oscillators; sensors; RC relaxation oscillators; compact wireless sensors; comparator delay; comparator design; constant charge subtraction scheme; line sensitivity; on-chip CMOS wake-up timer; oscillation period; power 5.8 nW; size 0.18 mum; temperature -10 degC to 90 degC; temperature dependence; temperature stability; ultra-low power oscillator; Clocks; Delays; Oscillators; Resistors; Temperature measurement; Temperature sensors; Thermal stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the

Conference_Location

San Jose, CA

Type

conf

DOI

10.1109/CICC.2014.6946008

Filename

6946008