研究目的
To design and characterize a new operational amplifier integrated by metal oxide TFTs with high gain and sufficient bandwidth for amplifying sensing signals, such as bio-potential signals or optical signals.
研究成果
The proposed OPAMP with high gain and sufficient bandwidth may be used to amplify sensing signals, such as bio-potential signals or optical signals. The design demonstrates the potential of metal oxide TFTs in integrated circuits for analog applications.
研究不足
The OPAMP may suffer from instability problems due to two positive feedback loops. The phase margin is relatively low (21.5 degrees), which is below the industrial practice requirement of 45°~60°.
1：Experimental Design and Method Selection:
The design involves a differential input stage and a differential-to-single ended stage, utilizing positive feedback and a transconductance-enhancement topology to improve gain.
2：Sample Selection and Data Sources:
The OPAMP was implemented on a glass substrate using metal oxide TFT manufacturing technology.
3：List of Experimental Equipment and Materials:
Equipment includes an oscilloscope (DSO-X 4014A), a signal generator (NF WF1948), and a semiconductor parameter analyzer (Agilent B1500A). Materials include molybdenum (Mo) for gate electrodes, SiO2 and SiNx as insulator layers, and IZO as the active layer.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves depositing and patterning layers for gate electrodes, insulator layers, active layer, etch-stop layer, source and drain electrodes, and a protective layer. Measurements were carried out under normal room temperature and daylight conditions.
5：Data Analysis Methods:
The performance of the OPAMP was evaluated based on voltage gain, bandwidth, unity-gain frequency, phase margin, and DC power consumption.
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