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Temperature Sensor employing Ring Oscillator composed of Poly-Si Thin-Film Transistors: Comparison between Lightly-Doped and Offset Drain Structures
Jun TAYA Kazuki KOJIMA Tomonori MUKUDA Akihiro NAKASHIMA Yuki SAGAWA Tokiyoshi MATSUDA Mutsumi KIMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 2014/11/01
Online ISSN: 1745-1353
Type of Manuscript: INVITED PAPER (Special Section on Electronic Displays)
temperature sensor, ring oscillator, poly-Si, thin-film transistor (TFT), lightly-doped drain structure (LDD), offset drain structure,
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We propose a temperature sensor employing a ring oscillator composed of poly-Si thin-film transistors (TFTs). Particularly in this research, we compare temperature sensors using TFTs with lightly-doped drain structure (LDD TFTs) and TFTs with offset drain structure (offset TFTs). First, temperature dependences of transistor characteristics are compared between the LDD and offset TFTs. It is confirmed that the offset TFTs have larger temperature dependence of the on current. Next, temperature dependences of oscillation frequencies are compared between ring oscillators using the LDD and offset TFTs. It is clarified that the ring oscillator using the offset TFTs is suitable to detect the temperature. We think that this kind of temperature sensor is available as a digital device.