DocumentCode :
63605
Title :
A Temperature-to-Digital Converter for a MEMS-Based Programmable Oscillator With 
Frequency Stability and  integrated phase noise (12 kHz to 20 MHz). A key component of this system is a thermistor-based temperature-to-digital converter (TDC) which enables accurate and low noise compensation of temperature-induced variation of the MEMS resonant frequency. The TDC utilizes several circuit techniques including a high-resolution tunable reference resistor based on a switched-capacitor network and fractional-N frequency division, a switched resistor measurement approach which allows a pulsed bias technique for reduced noise, and a VCO-based quantizer for digitization of the temperature signal. The TDC achieves 0.1-mK (rms) resolution within a 5-Hz bandwidth while consuming only 3.97 mA for all analog and digital circuits at 3.3-V supply in 180-nm CMOS.</div>
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<div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Keywords : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>CMOS analogue integrated circuits; analogue-digital conversion; micromechanical devices; switched capacitor networks; voltage-controlled oscillators; CMOS technology; MEMS resonant frequency; MEMS-based programmable oscillator; VCO-based quantizer; bandwidth 5 Hz; current 3.97 mA; fractional-N frequency division; frequency 12 kHz to 20 MHz; frequency stability; high-resolution tunable reference resistor; integrated phase noise; low noise compensation; pulsed bias technique; quartz-based frequency references; size 180 nm; switched resistor measurement approach; switched-capacitor network; temperature -40 degC to 85 degC; temperature signal digitization; temperature-induced variation; temperature-to-digital converter; thermistor-based TDC; thermistor-based temperature-to-digital converter; voltage 3.3 V; Noise; Oscillators; Resistors; Resonant frequency; Switches; Temperature measurement; Temperature sensors; Fractional-<formula formulatype=)
${N}$ frequency synthesizer; MEMS; VCO-based quantizer; high frequency stability; low phase noise; phase-locked loop (PLL); pulsed biasing; quartz alternative; reference frequency; switched resistor; switched-capacitor resistor; temperature compensation; temperature-to-digital; thermistor;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2012.2218711
Filename :
6341095
Link To Document :
