Low noise CMOS temperature sensor with on-chip digital calibration

Yunjong Park, Hyungseup Kim, Youngwoon Ko, Yeongjin Mun, Sangmin Lee, Ji Hoon Kim, Hyoungho Ko

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In this paper, we present a low-noise CMOS temperature sensor with an on-chip digital calibration circuit. The low-voltage bandgap reference circuit is designed to generate current proportional to absolute temperature (PTAT) using a parasitic NPN bipolar junction transistor (BJT). To adjust the output offset and gain of the temperature sensing core, an additional calibration stage based on the differential to the single amplifier (D2S) using a differential difference amplifier (DDA) is designed. A calibration circuit with low power and small size can be implemented using the D2S. Also because of the D2S, the conventional multistage offset and gain calibration circuits can be reduced to a single-stage circuit. The analog output is converted to a digital output using a 12-bit successive approximation register (SAR) analog-to-digital converter (ADC). A coarse calibration with 5-bit resolution is performed in the analog domain using a DDA-based calibration circuit, and a fine calibration using a 16-bit arithmetic engine is performed in the digital domain. The temperature sensor IC is implemented using a CMOS 0.18 μm process with an active area of 0.2216 mm2. The power consumption is 48.6 μW with a 1.8 V supply. The IC can measure temperatures from 10 to 60 °C. The measured gain is 28.36 mV/°C. The input-referred temperature noise is measured to be 0.26 °CRMS with a 200 Hz bandwidth.

Original languageEnglish
Pages (from-to)1025-1030
Number of pages6
JournalSensors and Materials
Issue number7
StatePublished - 2017

Bibliographical note

Funding Information:
This research was supported by the NanoMaterial Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (2015M3A7B7045527).

Publisher Copyright:
© 2017 MYU K.K.


  • Bandgap reference
  • On-chip calibration
  • Temperature sensor


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