Design of a temperature sensor with optimized noise-power performance

Journal article (2018)

Authors

A. Heidari Smartec BV, University of Guilan, Electronic Instrumentation - EEMCS
G. Wang Smartec BV, Electronic Instrumentation - EEMCS
Motahareh Abdollahpour University of Guilan
G.C.M. Meijer SensArt, Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Smart temperature sensor Duty-cycle modulation Dynamic element matching Resolution figure of merit
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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents the design aspect of a BJT-based temperature sensor implemented in standard CMOS technology that is optimized for its noise-power performance. The interface electronics of the sensor consists of a continuous-time duty-cycle modulator, where a capacitor is periodically charged and discharged, with two temperature-dependent current sources, between two thresholds determined by a Schmitt trigger. In order to optimize the noise properties of the sensor, the major noise sources have been analyzed and optimized using target specifications of the manufacturer. Experimental results are in agreement with those of simulations and analytical calculations. The sensor has been implemented in 0.7μm CMOS technology. At 3.3V supply, the measured temperature resolution amounts to 3mK for a measurement time of 1.8ms. The test results show that a Resolution Figure of Merit (RFoM) of 3.2pJK2 has been achieved in this design, which is the best reported result for BJT-based temperature sensors in the market.