本論文主要由兩個研究主題所組成： 一個避免或移除各種干擾的小訊號記錄研究實現以及使用壓電晶體實現人體感測傳輸器之應用。
第一個主題主要在探討ECG訊號與雜訊紀錄，在不同型態的干擾下實現。藉由低通濾波器移除受到電源雜訊干擾的ECG訊號以及藉由開關與高通濾波器在干擾被放大前避免ECG的motion artifact影響。最後，本論文提出了一個適合應用在教學上的低成本雜訊記錄系統，此系統主要針對電阻以及放大器所產生的雜訊用LabVIEW做記錄與分析。
第二個主題探討身體感測傳輸器的應用。 主要藉由壓電晶體與人體的電容耦合特性之結合來達到交換訊息的功能。 且用四種方法證明，訊號能經由設限在一頻寬的窄頻濾波器而被接收器接收。最後，用0.35μm 2P4M CMOS製程設計此應用電路之電荷放大器來偵測身體感測器所傳輸之訊號且製作成晶片。

This thesis consists of two subjects of research: eliminating, by avoidance or removal, the effects of different types of interference on small signal recording, and a body-sensor transmitter application utilizing piezo sensors.
The first topic demonstrates ECG signal and noise signal recording in the presence of various types of interference. A low-pass filter is proposed to remove power-line interference of ECG signals, and a switch between high-pass filters before amplification is proposed to avoid motion artifacts in the ECG signal. Finally, a low-cost noise recording system for educational uses that can record and analyze the noise of resistors and amplifiers in the LabVIEW program is proposed.
The second topic concerns the application of a body-sensor transmitter. The sensor uses piezo film and combines the characteristics of piezo film with the characteristics of the human body and can exchange information by capacitor coupling. The signal used in the body-sensor transmitter is designed for a fixed frequency using narrow band-pass filters and is received by receivers via four methods as confirmation. Finally, the charge amplifier designed to detect signals is fabricated using a 0.35μm 2P4M CMOS process.

Chinese Abstract i
Abstract ii
Acknowledgements iii
List of Figures vi
List of Tables x
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Thesis Organization 2
Chapter 2 Small signal Recording in the Presence of Interference 3
2.1 Removal of ECG Signal Interference 3
2.1.1 ECG Signal Introduction 3
2.1.2 Interference of ECG Signals 4
2.1.3 Filter Design 6
2.1.4 The Principle of ECG Signal Recording 9
2.1.5 Results of Filter Use 11
2.2 Amplifier Offset Compensation 12
2.2.1 Basic Concept and Idea 12
2.2.2 Simulation Results 15
2.2.3 The Experimental Results 18
2.3 Noise Recording in the Presence of Interference 21
2.3.1 Basic Concept of Noise 21
2.3.2 Introduction to Noise Measurement 23
2.3.3 Avoiding Bad Parameters 23
2.3.4 The Gain Bandwidth Product 26
2.3.5 Hardware Design 28
2.3.6 Software Design 31
2.3.7 Measurement Results 33
Chapter 3 Application of Body-sensor Transmitter 36
3.1 Introduction 36
3.2 The Characteristics of Piezoelectric Film 37
3.2.1 The Capacitance of the Piezo Film 38
3.2.2 The Pressure Signal Detection of the Piezo Film 40
3.3 The Principle of Body-sensor Transmission 41
3.3.1 Signal Detection Circuit 42
3.3.2 Measured Results 46
3.4 Low-Power Charge Amplifier Design for Integrated Circuits 50
3.4.1 The Basic Concept of Charge Amplifiers 50
3.4.2 Structure of the Proposed Circuit 51
3.4.3 Differential Output Amplifier 52
3.4.4 CMFB Circuit 53
3.4.5 Simulation Results 55
3.4.6 Experimental Results and Discussion 61
Chapter 4 Conclusion and Future Works 65
4.1 Conclusion 65
4.2 Future Works 65

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