A Time-Domain SAR Smart Temperature Sensor With Curvature Compensation and a 3σ Inaccuracy of −0.4°C ∼ +0.6°C Over a 0°C to 90°C Range
| Autor: | Kai-Ming Wang, Poki Chen, Chun-Chi Chen, Yu-Han Peng, Yu-Shin Wang |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Engineering
business.industry Bipolar junction transistor Electrical engineering Linearity Hardware_PERFORMANCEANDRELIABILITY Chip Temperature measurement Time-to-digital converter Intelligent sensor CMOS Hardware_INTEGRATEDCIRCUITS Electronic engineering Time domain Electrical and Electronic Engineering business |
| Zdroj: | IEEE Journal of Solid-State Circuits. 45:600-609 |
| ISSN: | 1558-173X 0018-9200 |
| DOI: | 10.1109/jssc.2010.2040658 |
| Popis: | This paper describes a time-domain temperature sensor based on a successive approximation algorithm. Without using any bipolar transistor, a temperature sensor composed of a temperature-dependent delay line (TDDL) is utilized to generate a delay proportional to the measured temperature. A binary-weighted adjustable reference delay line (ARDL) is adopted with an effective delay varied by a SAR control logic to approximate the TDDL delay for output coding. For linearity enhancement, a curvature compensation between both delay lines is invented to achieve the best ever accuracy among inverter-delay-based smart temperature sensors. With two-point calibration, a -0.4°C ˜ +0.6°C inaccuracy (3σ) over a 0°C ˜ 90°C temperature operation range has been measured for 23 test chips. With 10 output bits, the proposed sensor achieves a resolution better than 0.1°C and a chip area of 0.6 mm2 in a TSMC 0.35-μm standard digital CMOS process. The sensor's average current consumption is 11.1 μA at a conversion rate of 2 samples/s. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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