Title :
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
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;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6946008
