Analog Front-End Circuit for Biomedical System

According to statistics of the Ministry of Health and Welfare, chronic disease is one of the leading causes of death, especially in the elderly population. Because of the aging society and the threat of chronic disease, there is a high demand for personal telehealth systems. The research and application in biomedical integrated circuit become a mainstream. Due to the development of semiconductor technology and the integrated circuit design, the analog and digital circuit can be combined into a same chip. A bio-signal sensing and monitoring SoC can be realized. It is possible to develop a bio-signal sensing SoC for telehealth systems. In order to realize a bio-signal sensing system, an analog front-end circuit plays an important role in processing analog bio-signal. In this thesis, two analog front-end circuits for bio-signal sensing are fabricated in TSMC 0.35-μm process technology. An interface circuit for multi-sensor system and a readout circuit for alternating current (AC) impedance-type sensor are proposed.