期刊
IEEE SENSORS JOURNAL
卷 15, 期 8, 页码 4234-4240出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2015.2414667
关键词
Temperature sensor; on-chip; PTAT; low power; temperature to frequency converter; single point calibration
资金
- Aalto University, Espoo, Finland, through the EFFINANO Project
- Academy of Finland through the AUTOVOLT Project
In this paper, we are proposing a simple energy efficient on-chip temperature to frequency converter circuit. The proposed arrangement senses the temperature in terms of the proportional to absolute temperature (PTAT) current. The temperature equivalent PTAT current is then converted into frequency using the source coupled multivibrator circuit. The proposed circuit has been designed and fabricated in a standard 180-nm CMOS technology and occupies silicon area of approximate to 0.058 mm(2). The measurements were performed on ten prototypes. The proposed architecture is capable of working in the temperature range of -40 degrees C to +85 degrees C with the supply voltage of 0.9 V +/- 10%. The smart temperature sensor achieves a maximum temperature inaccuracy <+/- 1 degrees C after applying single point calibration. The average power consumption is approximate to 600 nW at +85 degrees C for 0.9 V supply voltage.
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