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Sensors 2011, 11(11), 10308-10325; doi:10.3390/s111110308

Chip Implementation with a Combined Wireless Temperature Sensor and Reference Devices Based on the DZTC Principle

1,*  and 2
1 Department of Mechanical Engineering, National Taiwan University, Taipei, 106, Taiwan 2 Department of Electrical Engineering, National Taiwan University, Taipei, 106, Taiwan
* Author to whom correspondence should be addressed.
Received: 16 September 2011 / Revised: 24 October 2011 / Accepted: 25 October 2011 / Published: 31 October 2011
(This article belongs to the Section Physical Sensors)
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This paper presents a novel CMOS wireless temperature sensor design in order to improve the sensitivity and linearity of our previous work on such devices. Based on the principle of CMOS double zero temperature coefficient (DZTC) points, a combined device is first created at the chip level with two voltage references, one current reference, and one temperature sensor. It was successfully fabricated using the 0.35 μm CMOS process. According to the chip results in a wide temperature range from −20 °C to 120 °C, two voltage references can provide temperature-stable outputs of 823 mV and 1,265 mV with maximum deviations of 0.2 mV and 8.9 mV, respectively. The result for the current reference gives a measurement of 23.5 µA, with a maximum deviation of 1.2 µA. The measurements also show that the wireless temperature sensor has good sensitivity of 9.55 mV/°C and high linearity of 97%. The proposed temperature sensor has 4.15-times better sensitivity than the previous design. Moreover, to facilitate temperature data collection, standard wireless data transmission is chosen; therefore, an 8-bit successive-approximation-register (SAR) analog-to-digital converter (ADC) and a 433 MHz wireless transmitter are also integrated in this chip. Sensing data from different places can be collected remotely avoiding the need for complex wire lines.
Keywords: DZTC; temperature sensor; SAR ADC DZTC; temperature sensor; SAR ADC
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chang, M.-H.; Huang, Y.-J.; Huang, H.-P.; Lu, S.-S. Chip Implementation with a Combined Wireless Temperature Sensor and Reference Devices Based on the DZTC Principle. Sensors 2011, 11, 10308-10325.

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