Wide-range CTAT and PTAT sensors with second-order calibration for on-chip thermal monitoring. Issue 9 (September 2015)

• Record Type: Journal Article
• Authors: Wang, Chua-Chin; Lu, Wen-Je; Wu, Tzu-Chao
• Is Part Of: Microelectronics journal. Volume 46:Issue 9(2015)
• Page Start: 819
• Page End: 824
• Publication Date: 2015-09
• Subjects: Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2015.06.004
• Languages: English
• ISSNs: 0959-8324

Abstract

<abstract abstract-type="author" id="ab0005"> <title id="sect0005">Abstract</title> <sec> <p id="sp0065">This paper presents wide-range complementary to absolute temperature (CTAT) and proportional to absolute temperature (PTAT) sensors with second-order calibration for on-chip thermal monitoring. Particularly, a current mirror and an n-well resistor are used in these sensors to eliminate the second-order term of the temperature coefficient to linearize the transfer function between the output voltage and the temperature. The proposed CTAT and PTAT sensors are implemented on silicon using a typical 0.18 μm CMOS process. The core area of the CTAT and PTAT sensors is 0.0125 mm<sup>2</sup> and 0.0074 mm<sup>2</sup>, respectively. In the range from <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2frffp9r" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0023.gif" overflow="scroll" id="d13e708" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>−</mml:mo><mml:mn>55</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:math></alternatives></inline-formula> to <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2frfgbvw" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0024.gif" overflow="scroll" id="d13e719" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>155</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:math></alternatives></inline-formula>, the worst deviation of the CTAT and PTAT temperature sensors is measured to be <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2frfftnb" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0025.gif" overflow="scroll" id="d13e728" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>−</mml:mo><mml:mn>3.75</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi><mml:mspace width="0.33em" /><mml:mi>to</mml:mi><mml:mo>+</mml:mo><mml:mn>3.34</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2frfg8c4" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0026.gif" overflow="scroll" id="d13e752" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>−</mml:mo><mml:mn>3.73</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi><mml:mspace width="0.33em" /><mml:mi>to</mml:mi><mml:mo>+</mml:mo><mml:mn>3.85</mml:mn><mml:mspace width="0.25em" /><mml:mo>°</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:math></alternatives></inline-formula>, respectively. The maximum non-linearity reduction of the CTAT and PTAT sensors is 59.84% and 87.48%, respectively, by the proposed second-order calibration. Notably, the overhead area of the CTAT and PTAT sensors is only 0.64% and 1.08%, respectively.</p> </sec> </abstract>