Title :
A 2µA temperature compensated mems-based real time clock with ±4 ppm timekeeping accuracy
Author :
Gronicz, Jakub ; Pulkkinen, Mika ; Yücetaş, Mikail ; Halonen, Kari
Author_Institution :
Dept. of Micro & Nanosci., Aalto Univ., Espoo, Finland
Abstract :
This paper presents a MEMS-based real time clock with a temperature compensation system. The implemented circuit achieves a timekeeping accuracy of ±4 ppm over -40 °C... 85 °C temperature range. It is built using a 27 kHz silicon resonator, differential PTAT temperature sensor with a 2nd order ΣΔADC, and a DSP block for temperature frequency compensation. The circuit is powered by a 1.8V supply and draws 2 μA current. The system has been implemented using a 0.18 μm CMOS process.
Keywords :
CMOS digital integrated circuits; clocks; compensation; digital signal processing chips; low-power electronics; resonators; sigma-delta modulation; temperature sensors; 2nd order ΣΔADC; CMOS process; DSP block; MEMS-based real time clock; current 2 muA; differential PTAT temperature sensor; frequency 27 kHz; silicon resonator; size 0.18 mum; temperature -40 C to 85 C; temperature compensation system; temperature frequency compensation; Clocks; Frequency measurement; Oscillators; Resonant frequency; Silicon; Temperature measurement; Temperature sensors;
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
DOI :
10.1109/ISCAS.2014.6865185
