本論文為單頻段被動式UHF RFID Tag，依照EPC global Class‐1 Generation‐2 UHF RFID Protocol的規範所設計，UHF為860MHz ~ 960MHz，本論文應用頻段為925MHz，利用連續弦波訊號對RFID Tag進行充電，將交流訊號轉成直流訊號供應給整個電路，接收Preamble訊號並回傳RN16(16bits Random Number)，將結果經過FM0編碼後利用Backscatter反散射回傳給RFID Reader。
被動式RFID Tag由於沒有電源供應，因此低功耗設計非常重要，利用疊接式倍壓器將交流轉為直流儲存於電容，沒有使用穩壓器及震盪器，利用Low Power Voltage Reference電路取代穩壓器，邏輯閘與RC充放電代替震盪器，減少功率消耗，後模擬結果最低接收功率為-26dBm，量測結果最低接收功率-3dBm，本論文利用聯華電子(UMC) 0.18um 1P6M CMOS製程實現。

This thesis presents a single-band passive UHF RFID tag chip. This design relies on the EPC global Class‐1 Generation‐2 UHF RFID Protocol. We use the UHF frequency at 925MHz. The 925MHz continuous wave charges the RFID Tag. Next, The tag receives the preamble signal from reader and backscatters the RN16(16-bit Random Number). The output signal is encoded by the FM0 encoder. The FM0 signal controls the switching the backscatter circuit to reflect and modulate the 925MHz CW wave back to the reader.
Because a passive RFID tag doesn’t have a power supply, low power design is very important. We use stacked charge pump circuit to convert RF signal and store to DC energy power at off-chip capacitance. There is no regulator in the tag. In order to reduce the power consumption, we use a low power reference circuit to replace the regulator. In post-simulation, the input sensitivity can achieve -26 dBm. At the measurement, the input sensitivity can achieve -3 dBm. The proposed passive UHF RFID tag is fabricated in UMC 0.18um 1P6M CMOS process.

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