Power Aware Electronics For Temperature Sensor

Tammali, Purushotham and Dutta, Asudeb (2017) Power Aware Electronics For Temperature Sensor. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Power consumption is one of the main design constraints in today’s integrated circuits. For systems like wearable e lectronics, UAVs, IOT systems powered by batteries which are charged using the energy harvested from various sources like RF, Thermal, Solar and Vibration , ultra - low power consumption is paramount. In these systems, Transducers which convert physical parameters into electrical parameters and the analog - to - digital converters (ADCs) are key components as the interface between the analog world and the digital domain. This thesis addresses the design challenges, strategies, as well as circuit techniques of ultra - low - power signal Front End used in several low power electronic systems in general and temperature measurement systems in particular . In this thesis, T hermistor and Wheat stone bridge based temperature measurement system has been implemented. This system has been directly interfaced with a SAR ADC without using an amplifier. This reduces the power used by amplifier. The thermistor used in this system is fabricated at IIT Hyderabad Nano - X laboratory. It has been characterised and the coefficients of stein - hart equation have been calculated. M onotonic SAR ADC was designed in 180nm CMOS with 1 - V power supply and a 1 - kS/s sampling rate with switching energy o f about 100nW.

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