Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 60, Issue 9, Pages 2241-2248Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2013.2246254
Keywords
Frequency-to-digital converter; process variation compensation; temperature sensor
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Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2011-0020128]
- National Research Foundation of Korea [2011-0020128] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper presents a temperature sensor based on a frequency-to-digital converter with digitally controlled process compensation. The proposed temperature sensor utilizes ring oscillators to generate a temperature dependent frequency. The adjusted linear frequency difference slope is used to improve the linearity of the temperature sensor and to compensate for process variations. Furthermore, an additional process compensation scheme is proposed to enhance the accuracy under one point calibration. With one point calibration, the resolution of the temperature sensor is 0.18 degrees C/LSB and the maximum inaccuracy of 20 measured samples is less than +/- 1.5 degrees C over a temperature range of 0 degrees C similar to 110 degrees C. The entire block occupies 0.008 mm(2) in 65 nm CMOS and consumes 500 mu W at a conversion rate of 469 kS/s.
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