A resistor-based temperature sensor for a real time clock with ±2ppm frequency stability

Author

Pyoungwon Park ; Makinwa, Kofi A. A. ; Ruffieux, David

Author_Institution

Electron. Instrum. Lab., Delft Univ. of Technol., Delft, Netherlands

fYear

2014

fDate

22-26 Sept. 2014

Firstpage

391

Lastpage

394

Abstract

A temperature sensor based on the temperature-dependence of integrated poly-silicon resistors is used to stabilize the quartz-crystal of a 131kHz real-time clock (RTC). After a 3-point calibration, the sensor achieves an inaccuracy of less than ±0.12°C (min-max) from -40°C to 85°C, which translates into a frequency stability of less than ±2ppm. The sensor also achieves 2.8mK (rms) resolution in a 32ms conversion time, which corresponds to a state-of-the-art resolution FOM of 8pJK².

Keywords

calibration; clocks; elemental semiconductors; frequency stability; quartz; resistors; silicon; temperature measurement; temperature sensors; 3-point calibration; FOM; RTC; Si; frequency 131 kHz; frequency stability; integrated polysilicon resistor; quartz-crystal stability; real time clock; resistor-based temperature sensor; temperature -40 degC to 85 degC; temperature 2.8 mK; time 32 ms; Calibration; Frequency locked loops; Oscillators; Resistors; Temperature measurement; Temperature sensors; Thermal stability; TCXO; Wien-bridge; real-time clock; temperature compensated quartz-crystal oscillator; temperature sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

European Solid State Circuits Conference (ESSCIRC), ESSCIRC 2014 - 40th

Conference_Location

Venice Lido

ISSN

1930-8833

Print_ISBN

978-1-4799-5694-4

Type

conf

DOI

10.1109/ESSCIRC.2014.6942104

Filename

6942104