研究目的
To design and fabricate a biopotential front-end circuit using a-IGZO TFTs on flexible plastic substrate for EMG applications, achieving high SNR, input impedance, and spatial resolution for the diagnosis of neuromuscular disorders.
研究成果
The front-end circuit described can be used to implement an EMG measurement matrix on foil, reducing the number of connections to a silicon chip. It improves the state of the art in terms of input impedance, power consumption, and area, and has been validated in the lab and in-vivo.
研究不足
The circuit lacks common mode rejection due to the use of unipolar electrodes, which could be improved with an active leg driving for common mode rejection. The comparison of power consumption with previous works is difficult due to differences in circuit BW, TFT 1/f noise, and mobility.
1：Experimental Design and Method Selection:
The front-end circuit was designed with an input chopper for noise reduction and Frequency Division Multiplexing, a source follower buffer, a gain boosted amplification stage, and an output buffer.
2：Sample Selection and Data Sources:
The circuit was fabricated on a 6 inch flexible polyimide substrate. In-vivo EMG measurements were performed using standard gel electrodes on a volunteer's forearm.
3：List of Experimental Equipment and Materials:
a-IGZO TFTs, flexible polyimide substrate, standard gel electrodes.
4：Experimental Procedures and Operational Workflow:
The circuit was characterized at chopping frequencies from 5 to 8 kHz, measuring gain, bandwidth, input noise, and input impedance. In-vivo EMG signals were recorded and post-processed.
5：Data Analysis Methods:
The output signal was post-processed by de-chopping, filtering, and scaling by the FE gain to analyze EMG bursts.
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