TY - JOUR
T1 - Oxide TFT Frontend Amplifiers for Flexible Sensing Systems
AU - Xu, Yuming
AU - Wu, Zhaohui
AU - Li, Bin
AU - Deng, Sunbin
AU - Zhong, Wei
AU - Li, Guijun
AU - Luo, Dongxiang
AU - Sze Yan Yeung, Fion
AU - Kwok, Hoi Sing
AU - Chen, Rongsheng
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - This article presents a frontend amplifier based on the 50- $\mu \text{m}$ channel length n-type only indium-tin-oxide (ITO)-stabilized ZnO thin-film transistors (TFTs) on glass substrate. The amplifier has an external-bias ac-coupled, open-loop capacitor bootstrap structure. The area and power consumption are 41 mm2 and 0.1 mW (8-V supply), respectively. Electrical measurement results show a gain of 20 dB, a bandwidth of 3 Hz-6 kHz, a common-mode rejection ratio (CMRR) up to 42 dB, an input impedance of 100 $\text{M}\Omega $ , and an input-referred noise of $106 ~\mu \text{V}_{rms}$ (integrated from 1 to 200 Hz). The noise efficiency factor (NEF) and power efficiency factor (PEF) of the amplifier are, respectively, 248 and $4.9\times10$ 5, which is comparable among the state of the arts. The amplifier is successfully used to measure the heart-rate signal, which demonstrates its practicality.
AB - This article presents a frontend amplifier based on the 50- $\mu \text{m}$ channel length n-type only indium-tin-oxide (ITO)-stabilized ZnO thin-film transistors (TFTs) on glass substrate. The amplifier has an external-bias ac-coupled, open-loop capacitor bootstrap structure. The area and power consumption are 41 mm2 and 0.1 mW (8-V supply), respectively. Electrical measurement results show a gain of 20 dB, a bandwidth of 3 Hz-6 kHz, a common-mode rejection ratio (CMRR) up to 42 dB, an input impedance of 100 $\text{M}\Omega $ , and an input-referred noise of $106 ~\mu \text{V}_{rms}$ (integrated from 1 to 200 Hz). The noise efficiency factor (NEF) and power efficiency factor (PEF) of the amplifier are, respectively, 248 and $4.9\times10$ 5, which is comparable among the state of the arts. The amplifier is successfully used to measure the heart-rate signal, which demonstrates its practicality.
KW - Frontend amplifier
KW - heart-rate measurement
KW - metal-oxide thin-film transistors (TFTs)
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000724501000040
UR - https://openalex.org/W3209164364
UR - https://www.scopus.com/pages/publications/85118575614
U2 - 10.1109/TED.2021.3120023
DO - 10.1109/TED.2021.3120023
M3 - Journal Article
SN - 0018-9383
VL - 68
SP - 6190
EP - 6196
JO - IEEE Transactions on Electron Devices
JF - IEEE Transactions on Electron Devices
IS - 12
ER -