期刊
IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS
卷 7, 期 1, 页码 60-70出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JETCAS.2016.2616723
关键词
a-IGZO; amplifier; bio-potential; ECG; EMG; EHG; flexible; flicker noise; front-end; thin film transistor.
资金
- Dutch Technology Foundation STW
- Netherlands Organisation for Scientific Research (NWO)
- Ministry of Economic Affairs
Three novel differential amplifier topologies using double gate a-IGZO TFTs on flexible substrate are presented in this paper. The designs exploit positive feedback and a load with self-biased top gate to achieve the highest static gain in single stage a-IGZO amplifiers reported to date. After fabrication, the three amplifiers exhibit respectively a static gain of 14 dB, 21.5 dB, and 30 dB, with a bandwidth of 2 kHz, 400 Hz, and 150 Hz. Also, for each circuit the input referred noise has been measured to be 420 mu V-rms, 195 mu V-rms, and 146 mu V-rms, respectively. Based on these results, the a-IGZO amplifier providing the highest gain is suitable as front-end for heart rate measurements and, with some further optimization verified in simulation, can also be used for other bio-potential applications, like electro hysterogram and electro cardiogram.
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