All-MOS self-referenced temperature sensor

S. Xie; A. Theuwissen

doi:10.1049/el.2019.1784

All-MOS self-referenced temperature sensor

S. Xie, A. Theuwissen

Electronic Instrumentation

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Abstract

This Letter presents an all-MOS self-referenced temperature sensor, intended for thermal compensation of dark current in CMOS image sensors (CIS). Its thermal sensing front-end is based on a self-biased nMOS pair working in the subthreshold region. Biased with ratiometric currents, the differential voltage output of the nMOS pair is proportional to the absolute temperature. The thermal sensing voltage is quantised by a self-referenced first-order incremental delta-sigma ADC, which obtains its reference voltage from the thermal sensing front-end. This reference voltage has been virtually attenuated, through switch capacitor charge sampling, to improve the resolution of the temperature sensor. Measured between -20 and 80°C, the proposed temperature sensor achieves an inaccuracy within ±0.55°C.

Original language	English
Pages (from-to)	1045-1047
Number of pages	3
Journal	Electronics Letters
Volume	55
Issue number	19
DOIs	https://doi.org/10.1049/el.2019.1784
Publication status	Published - 19 Sept 2019

Keywords

analogue-digital conversion
capacitors
CMOS image sensors
CMOS integrated circuits
delta-sigma modulation
temperature measurement
temperature sensors

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10.1049/el.2019.1784

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title = "All-MOS self-referenced temperature sensor",

abstract = "This Letter presents an all-MOS self-referenced temperature sensor, intended for thermal compensation of dark current in CMOS image sensors (CIS). Its thermal sensing front-end is based on a self-biased nMOS pair working in the subthreshold region. Biased with ratiometric currents, the differential voltage output of the nMOS pair is proportional to the absolute temperature. The thermal sensing voltage is quantised by a self-referenced first-order incremental delta-sigma ADC, which obtains its reference voltage from the thermal sensing front-end. This reference voltage has been virtually attenuated, through switch capacitor charge sampling, to improve the resolution of the temperature sensor. Measured between -20 and 80°C, the proposed temperature sensor achieves an inaccuracy within ±0.55°C.",

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AU - Theuwissen, A.

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AB - This Letter presents an all-MOS self-referenced temperature sensor, intended for thermal compensation of dark current in CMOS image sensors (CIS). Its thermal sensing front-end is based on a self-biased nMOS pair working in the subthreshold region. Biased with ratiometric currents, the differential voltage output of the nMOS pair is proportional to the absolute temperature. The thermal sensing voltage is quantised by a self-referenced first-order incremental delta-sigma ADC, which obtains its reference voltage from the thermal sensing front-end. This reference voltage has been virtually attenuated, through switch capacitor charge sampling, to improve the resolution of the temperature sensor. Measured between -20 and 80°C, the proposed temperature sensor achieves an inaccuracy within ±0.55°C.

KW - analogue-digital conversion

KW - capacitors

KW - CMOS image sensors

KW - CMOS integrated circuits

KW - delta-sigma modulation

KW - temperature measurement

KW - temperature sensors

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All-MOS self-referenced temperature sensor

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