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Temperature and Supply Voltage Monitoring with Current-mode Relaxation Oscillators | IEEE Conference Publication | IEEE Xplore

Temperature and Supply Voltage Monitoring with Current-mode Relaxation Oscillators


Abstract:

This paper presents a new family of temperature and supply voltage sensors based on an improved current-mode relaxation oscillator. The proposed sensor circuit overcomes ...Show More

Abstract:

This paper presents a new family of temperature and supply voltage sensors based on an improved current-mode relaxation oscillator. The proposed sensor circuit overcomes the finite input impedance of earlier current-mode relaxation oscillators, and it is paired with a novel opamp-free bandgap current reference. Two examples are presented: a VDD - controlled oscillator, and a temperature-controlled oscillator. The temperature-controlled oscillator operates at 11.3 MHz and consumes 11.14 uW while reaching a temperature nonlinearity error less than +0.85/-0.94°C, a resolution figure of merit of 11.5 pJ·K2, and an efficiency of 240 pJ/conv. The VDD-controlled oscillator has a nonlinearity error less than +28.7/-30.0mV from 1.2-1.8 V after two-point calibration.
Date of Conference: 05-07 October 2020
Date Added to IEEE Xplore: 10 February 2021
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Conference Location: Salt Lake City, UT, USA

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