| Summary: | 博士 === 國立中正大學 === 電機工程研究所 === 107 === This thesis presents a system chip for intelligent health care system with ECG signal acquisition and wireless transmission. This system is according to EPCglobal class-1 generation-2 communication protocol. Based on this protocol, proposed System-on-a-chip (SoC) can transmit signals without active RF circuits to achieve low power consumption and extend operating time of device. By fabricating a prototype chip to validate the proposed concept, the measurement results confirm that the SoC has characteristic of low power consumption, high data transmission efficiency, physiological signal recognition, and high-resolution signal conversion. The overall system includes a passive RF front-end circuit, a power management unit, a baseband processor, and an ECG signal acquisition circuit. The RF front-end circuit demodulates the received wireless signal and transmits the commands and parameters from the transmitter to the baseband processor. The baseband processor then controls the operation of the system according to the received commands and parameters. The ECG signal acquisition circuit includes a preamplifier, an analog filter, and a digital analog converter. The function of ECG signal acquisition circuit is to convert the physical electrical signal from electrode into digital information, and transmit the digitalized information to the external device through the baseband processor and backscatter. In the research of low-power analog circuit, this thesis proposes a low power analog filter with automatic bandwidth calibration mechanism. With the proposed transconductance operational amplifier, the power consumption of filter can be reduced by 46% while effectively increasing the linearity of the filter.
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