A time-to-digital-converter-based CMOS smart temperature sensor is proposed for high-accuracy portable applications. Conventional smart temperature sensors rely on analog-to-digital converter, which consumes much chip area and operation power, for digital output code conversion. For the purpose of cost reduction and power saving, the proposed smart temperature sensor first generates a pulse with a width proportional to the measured temperature. Then, a cyclic time-to-digital converter (TDC) is utilized to convert the pulse into the corresponding digital code. The test chips with extremely small area of 0.175mm2 were fabricated by TSMC CMOS 0.35um 2P4M process. Due to the excellent linearity of the digital output, the achieved measurement error is merely -0.6̃+0.8°C without any curvature correction or dynamic offset-cancellation. The effective resolution is better than 0.15°C, and the power consumption is 10μW.
|頁（從 - 到）||560-563|
|期刊||Proceedings - IEEE International Symposium on Circuits and Systems|
|出版狀態||已發佈 - 2005 十二月 1|
|事件||IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005 - Kobe, 日本|
持續時間: 2005 五月 23 → 2005 五月 26
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