應用於WLAN 802.11g AB類功率放大器

Abstract

本論文以TSMC 0.18μm 1P6M CMOS製程研製2.4GHz ISM頻帶CMOS功率放大器。第一部分是探討功率放大器的設計，輸出級的輸出匹配網路中的電感則採用雙層金屬纏繞的方式，提升電感的Q值，減少損耗，以提高功率附加效率。量測結果顯示功率放大器在2.4GHz其增益有19dB，在P1dB壓縮點的輸出功率與PAE為20dBm與25%，最大輸出功率與PAE分別為22.5dBm與36%。 第二部分則是提升效率的方法，相較於傳統的功率放大器架構，本論文提出電流再利用(Current reused)的技巧，讓兩級的功率放大器使用相同的電流，以減少直流功率的消耗，進而去提高功率附加效率。模擬結果顯示功率放大器在2.4GHz其增益有18.8dB，在P1dB壓縮點的輸出功率與PAE為19.3dBm與31%，最大輸出功率與PAE分別為19.9dBm與36%。

This thesis presents the development of 2.4GHz ISM-band CMOS power amplifier in TSMC 0.18um 1P6M CMOS process. The first main part is on the design of power amplifier. We use two layer metal lines to design the inductor in output matching network at output stage. It can increase the Q factor, and reduce the loss, the PAE can be improved. The measurements have shown this power amplifier provides a gain of 19dB at 2.4GHz, and the output power transmits 20dBm power with 25% power added efficiency at 1-dB compression point. The maximum output power of this amplifier is 22.5dBm with its power added efficiency as 36%. The second main part is a method of improving the efficiency. Compared with the conventional architectures of power amplifier. We presented the circuit technique of current reused. To make the two stage power amplifier using the same current, and improving the power added efficiency by reducing the DC power consumption. The simulations have shown this power amplifier provides a gain of 19dB at 2.4GHz, and the output power transmits 18.8dBm power with 31% power added efficiency at 1-dB compression point. The maximum output power of this amplifier is 19.9dBm with its power added efficiency as 36%.