應用於IEEE 802.11A之射頻前端發射器設計

Abstract

在本篇論文中完成了適用於IEEE 802.11a之前端發射器設計，本設計採用聯電0.18-μm 1P6M CMOS製程完成晶片製作，並以矽品QFN20完成封裝,。此顆IC的特點有二點，一是工作的頻寬相當寬(5G~6GHz)， 可包含U-NII (5.15G~5.825 GHz)內的所有頻帶。二是所需的外部元件非常少，不再需要balun跟 SAW 濾波器。IC中包含了兩個balun、直接升頻混波器以及三級的前置放大器。模擬的結果可以達到輸出1-dB點為10.5dBm(在5.5GHz)，其旁波抑制為38.7dB，轉換增益為13.8 dB。在實際的封裝量測中，輸出1-dB點為3.8dBm(在5.5GHz)，旁波抑制有34.3dB，轉換增益為10.5 dB。

In this thesis, a direct-conversion transmitter front-end for IEEE 802.11a has been designed and fabricated in UMC 0.18-μm 1P6M CMOS technology and packaged in SPIL QFN20. There are two features in this chip. First, it operates in the 5 to 6 GHz which covers the U-NII frequency band (5.15 to 5.825GHz). Secondly, it reduces the needs for external component. No external baluns and SAW filters are required. The transmitter front-end contains two baluns, an up-conversion mixer and a three-stage pre-amplifier. The simulation achieves an output 1-dB compression of 10.5 dBm at 5.5GHz with 38.7 dB sideband rejection and 13.8 dB conversion gain. The result of measurement exhibits an output 1-dB compression of 3.8 dBm at 5.5GHz with 34.3dB sideband rejection and 10.5dB conversion gain.