Fig. 1.
Block diagram of the proposed temperature sensor.
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| Citation: |
Liangbo Xie, Jiaxin Liu, Yao Wang, Guangjun Wen. A low-power CMOS smart temperature sensor for RFID application[J]. Journal of Semiconductors, 2014, 35(11): 115002. doi: 10.1088/1674-4926/35/11/115002
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L B Xie, J X Liu, Y Wang, G J Wen. A low-power CMOS smart temperature sensor for RFID application[J]. J. Semicond., 2014, 35(11): 115002. doi: 10.1088/1674-4926/35/11/115002.
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A low-power CMOS smart temperature sensor for RFID application
DOI: 10.1088/1674-4926/35/11/115002
More Information
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Abstract
This paper presents the design and implement of a CMOS smart temperature sensor, which consists of a low power analog front-end and a 12-bit low-power successive approximation register (SAR) analog-to-digital converter (ADC). The analog front-end generates a proportional-to-absolute-temperature (PTAT) voltage with MOSFET circuits operating in the sub-threshold region. A reference voltage is also generated and optimized in order to minimize the temperature error and the 12-bit SAR ADC is used to digitize the PTAT voltage. Using 0.18 μm CMOS technology, measurement results show that the temperature error is -0.69/+0.85℃ after one-point calibration over a temperature range of -40 to 100℃. Under a conversion speed of 1K samples/s, the power consumption is only 2.02 μW while the chip area is 230×225 μm2, and it is suitable for RFID application.-
Keywords:
- CMOS,
- low power,
- temperature sensor,
- sub-threshold,
- SAR ADC
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References
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