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標題: | K頻段互補式金氧半導體功率放大器之預先失真技術研究 Research on Pre-distortion Technique for K-Band CMOS Power Amplifier |
作者: | Kuan-Wei Chen 陳冠維 |
指導教授: | 林坤佑(Kun-You Lin) |
關鍵字: | 功率放大器,預先失真,K-頻段,線性化技術,數位調變, Power amplifier,Pre-distortion,K-band,Linearization technique,Digital modulation, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 本論文提出一個可以在互補式金氧半導體製程上實現的預先失真技術,它可以改善互補式金氧半導體功率放大器1-dB 功率點的線性度,進而提升功率大器的線性操作範圍。這個預先失真技術是採用一個N型的電晶體來當作線性器,並將差動訊號饋入此電晶體的閘極端和汲極端,使其補償範圍增加。文中分析了此改良式線性器的原理,和一些設計上的考量,並且也說明了線性器在功率放大器中如何達到最佳化。
我們使用180奈米互補式金氧半導體來製作一個使用預先失真技術在K頻段的兩級放大器。量測的結果顯示此功率放大器在靜態直流上消耗了219 毫瓦的功率,而在線性器打開的情況下,1 dB 功率點可以從16 dBm 提升至 17.5 dBm,而此點的功率附加效率也從10.6% 增加至 13.6% 。而此功率放大器的最大輸出飽和功率為19.9 dBm。三階項量測的結果顯示,線性器啟動的作用下,至少在輸出功率為8 dBm時會有6 dB 的線性度改善。 針對不同複雜度的數位調變,我們也以量測來驗證這個線性化的效果,在QPSK、16QAM、64QAM三種調變下,頻譜再生的情況被抑制了7-dB。 與其他發表過的24 GHz功率放大器做比較,本電路利用線性化的方法得到較佳的OP1dB、以及在OP1dB的功率附加效率。 In this thesis, a modified pre-distortion technique is proposed to improve the linear operation region of CMOS power amplifier. The linearizer is implemented by cold-mode FET and modified by a differential signal. This modified technique can increase the compensated ability of the linearizer, thus the proposed linearizer is more suitable for CMOS power amplifier than conventional linearizer. The operation details and the design considerations of the modified linearizer are investigated, and the optimization of the proposed linearizer in power amplifier design is also mentioned in the analysis. A K-band power amplifier with the pre-distortion technique is fabricated in 180-nm CMOS technology. According to the measurement, the proposed PA consumes 219 mW at quiescent state, and OP1dB is improved from 16 dBm to 17.5 dBm when linearizer is turned on. The PAE at OP1dB is also increase 3%. The Psat of the proposed power amplifier is 19.9 dBm. In two-tone measurement, the IMD3 is improved at least 6 dB with output power 8 dBm. The spectral re-growth of the PA is suppressed 7 dB by the linearizer in the different digital modulations. By utilizing the pre-distortion technique, the proposed PA has better output power and PAE at 1-dB compression point than other reported 24-GHz PA. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64355 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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ntu-101-1.pdf 目前未授權公開取用 | 5.98 MB | Adobe PDF |
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