Abstract
A low power all CMOS based smart temperature sensor is introduced without using any bandgap reference or any current/voltage analog-to-digital converter. With the intention of low cost, power and area consumption, the proposed temperature sensor operates in sub-threshold region generating a temperature dependent frequency from the proportional to absolute temperature current. A digital output is obtained from the temperature dependent frequency by using a 12-bit asynchronous counter. A temperature insensitive ring oscillator is designed used a reference clock signal in counter. The temperature sensor is implemented using 65 nm CMOS standard process and its operation is validated through post-layout simulation results, at a power supply of (0.5–1)-V. The sensor has an uncalibrated accuracy of +2.4/–2.1 °C for (–55 to 125) °C and a resolution of 0.28 °C for the same range. The power and area consumed by the sensor is 1.55 µW and 0.024 mm2 respectively.
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Bashir, M., Patri, S., Krishna Prasad, K.S.R. (2017). A Low Power, Frequency-to-Digital Converter CMOS Based Temperature Sensor in 65 nm Process. In: Kaushik, B., Dasgupta, S., Singh, V. (eds) VLSI Design and Test. VDAT 2017. Communications in Computer and Information Science, vol 711. Springer, Singapore. https://doi.org/10.1007/978-981-10-7470-7_62
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DOI: https://doi.org/10.1007/978-981-10-7470-7_62
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