射頻能量擷取裝置之設計與實現

本篇論文係研究一種射頻能量擷取(Radio Frequency Harvesting)系統，其包含：輸入匹配電路、整流器及倍壓電路等單元。在輸入匹配電路部分，利用power match技巧以期最大功率傳輸及最大轉換效率；在整流器(rectifier)與倍壓器(multiplier)部分，本研究選擇利用native MOS來實現，其具有超低臨界電壓(Threshold voltage, Vth )藉此可以改善電路在超低功率輸入時的轉換效率；而倍壓電路係使用MDVM(Modified Dickson voltage multiplier)電路，其利用狄克森倍壓電路(Dickson voltage multiplier)，將電壓提高。在內文中，將介紹適用於GSM及UTMS頻帶的射頻能量擷取裝置，並討論其差異與設計考量。本篇論文使用GSM/UTMS 頻帶之射頻能量擷取裝置，其電路設計與模擬皆使用標準台積電0.18um 1P6M CMOS製程來完成。模擬結果顯示，在GSM頻段的輸入-10 dBm時，其轉換效率為20%；而在負載阻抗為109k Ω的條件下，其輸出電壓為1.5 V，且其輸入返還損失為-17 dB。在UTMS頻段下，同樣是輸入為-10 dBm的條件下，其轉換效率亦可達20%；而在負載阻抗為142k Ω時，其輸出電壓可達1.9 V，且其輸入返還損失為-26 dB。

關鍵字

射頻能量； Native MOS ； MDVM

並列摘要

In this thesis, a radio-frequency energy harvester is presented for GSM/UTMS Band. The energy harvester consists of a matching network, a rectifier and a multiplier. The matching network is used to obtain the maximum power transfer by using power match concept and to have the maximum conversion efficiency. Furthermore, the native MOS is adopted with ultra-low threshold voltage (Vth) to improve the conversion efficiency in ultra-low power input for rectifier and multiplier. Especially for multiplier, the MDVM (Modified Dickson Voltage Multiplier) is selected to rise the output voltage. Moreover, the thesis introduces many applicable fields for GSM/UTMS RF energy harvester. All design is fabricated in TSMC 0.18-μm 1P6M standard CMOS process in this thesis. The simulation results present that the power efficiency, the output voltage and the input return loss are 20%, 1.5 volt and -17dB, respectively, with an input power of -10dBm and a load impedance of 109k Ω in GSM band; and that the power efficiency, the output voltage and the input return loss are 20%, 1.9 volt and -26dB, respectively, with the same input power and a load impedance of 142k Ω in UTMS band.

並列關鍵字

RF Energy, ； Native MOS ； MDVM

參考文獻

[1] H. Jabbar, Y. S. Song, and T. T. Jeong, "RF energy harvesting system and circuits for charging of mobile devices," IEEE Transactions on Consumer Electronics, vol. 56, 2010, pp. 247-253.

[2] M. Arrawatia, M. S. Baghini, and G. Kumar, "RF energy harvesting system from cell towers in 900MHz band," 2011 National Conference on Communications (NCC), 2011, pp. 1-5.

[3] 黃意善，適用於IEEE802.11a之CMOS 5.8GHz 接收機前端電路之晶片研發，碩士論文，國立台北科技大學電機系碩士班，台北，2010。

[4] Y. Fei and N. Soltani, "Design techniques for power harvesting of passive wireless microsensors," (MWSCAS 2008) 51st Midwest Symposium on Circuits and Systems, 2008, pp. 289-293.

[5] Fei Yuan, CMOS Circuit for Passive Wireless Microsystems, New York, Springer, 2010, pp.7-47.

國際替代計量

射頻能量擷取裝置之設計與實現

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