臺灣博碩士論文加值系統

In recent years, the applications of wireless communication become more and more important. Wireless communication plays an essential role in our daily lives. The market of the wireless applications grows up gradually. The demands of the wireless products also increase rapidly. Therefore, the miniaturization and low costs will be the first topic we are interested in.
In this thesis, We use the process of TSMC 1P6M 0.18um Mixed signal/RF CMOS to achieve the whole 915MHz UHF RFID passive tag circuit which consists of the multiplier, limiter, voltage reference, series regulator, demodulator modulator and digital signal process. The die area only requires 0.98146 x 0.27396 mm2 without pads. We present dual antenna architecture to increase the backscatter signal strength and try to decrease the power consumption for improved the reading distance between the reader and tag in this thesis. The experimental results show the passive tag can generate 1.5V through the incoming RF signal to power up other internal circuits. The farthest reading distance that we measured in anechoic chamber is approximate 3.5 meters.

Chapter 1 Introduction…………………………………………1
1.1 Motivation………………………………………………1
1.2 Thesis Organization……………………………………………………4
Chapter 2 Radio Frequency Identify System Overview………5
2.1 Introduction……………………………………………5
2.2Components of the RFID System……………………………………………………6
2.3Frequency and Standard of the RFID System……………………………………8
2.4 RFID System Research………………………………………12
Chapter3 Design of the 915MHz UHF RFID Passive Tag Circuit……………………………………15
3.1 Introduction……………………………………15
3.2 Architecture……………………………………………17
3.2.1 Charge Pump Circuit………………………………18
3.2.1.1 Voltage Multiplier circuit………………………………19
3.2.1.2 Limiter & Voltage Reference circuit………………………………24
3.2.1.3 Series Regulator circuit……………………………27
3.2.2 Demodulator Circuit………………………………………28
3.2.3 Modulator Circuit…………………………………30
3.2.4 Digital Signal Process Circuit…………………………………………31
3.3 Simulation Result…………………………………………32
3.3.1 Voltage Multiplier Circuit………………………………………32
3.3.2 Limiter & Voltage Reference Circuit…………………………………34
3.3.3 Series Regulator Circuit……………………………………36
3.3.4 Charge Pump Circuit……………………………38
3.3.5 Demodulator Circuit………………………………………………………40
3.3.6 Modulator Circuit…………………………………42
3.3.7 Digital Signal Process Circuit…………………45
3.3.8 Whole Circuit…………………………………………………………46
3.4 Power Consumption & Conversion Efficiency Simulation Result……………………………………48
3.5 Summary……………………………………………50
Chapter 4 Measurement Result…………………………51
4.1 The RF Front-End Circuit of the 915MHz UHF RFID Passive Tag (T18-97A)……………………………51
4.1.1 Architecture…………………………………………51
4.1.2 Matching Circuit…………………………………………………………53
4.1.3 Measurement Results……………………………………………………54
4.1.4 Summary……………………………………………………………63
4.2 915MHz UHF RFID Tag (T18-97B)…………………………………………64
4.2.1 Architecture……………………………………64
4.2.2 Matching Circuit……………………………………………………………65
4.2.3 Measurement Result…………………………………………………………66
4.2.4 Summary………………………………………………………………74
Chapter 5 Conclusion…………………………………………75
Appendix A Patent Search and Analysis………………………77
Reference………………………………………………………………83

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