Print Email Facebook Twitter A Temperature-to-Digital Converter Based on an Optimized Electrothermal Filter Title A Temperature-to-Digital Converter Based on an Optimized Electrothermal Filter Author Kashmiri, S.M. Xia, S. Makinwa, K.A.A. Faculty Electrical Engineering, Mathematics and Computer Science Department Microelectronics & Computer Engineering Date 2009-06-23 Abstract This paper describes the design of a CMOS temperature-to-digital converter (TDC). It operates by measuring the temperature-dependent phase shift of an electrothermal filter (ETF). Compared to previous work, this TDC employs an ETF whose layout has been optimized to minimize the thermal phase spread caused by lithographic inaccuracy. To minimize electrical phase spread, the TDC's front-end consists of a wide bandwidth gain-boosted transconductor. The transconductor's output current is then digitized by a phase-domain SigmaDelta modulator whose phase-summing node is realized by a chopper demodulator. To minimize the residual offset caused by the demodulator's switching action, the demodulator is located at the virtual ground nodes established by the transconductor's gain-boosting amplifiers. Measurements on 16 samples (within one batch) show that the TDC has an untrimmed inaccuracy of less than plusmn0.7degC (3sigma) over the military range (-55degC to 125degC). Subject electrothermal filtersphase-domain sigma-delta modulatorsynchronous demodulationtemperature sensors To reference this document use: http://resolver.tudelft.nl/uuid:9cdf67a8-8cf6-411c-b62c-5c1db0c147d7 DOI https://doi.org/10.1109/JSSC.2009.2020248 Publisher IEEE ISSN 0018-9200 Source IEEE Journal of Solid-State Circuits, 44 (7), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 IEEE Files PDF kashmiri2009.pdf 1.78 MB Close viewer /islandora/object/uuid:9cdf67a8-8cf6-411c-b62c-5c1db0c147d7/datastream/OBJ/view