3.1-10.6 GHz 互補式金氧半製程之超寬頻低雜訊放大器

Abstract

本篇論文主要是探討超寬頻低雜訊放大器之設計與分析。為了達到寬頻的輸入匹配，我們利用電阻電容負載的方式，分別對高頻及低頻作輸入匹配，及利用電感(LS)、電容(Cgd)回授來達成輸入匹配；為了達到寬頻的增益，使用並串連尖峰(shunt-series peaking)電感的頻寬延伸技術來完成寬頻增益的目的；利用修改後的疊接(cascode)架構電路，獲得較大的增益與隔絕度；此放大器利用第一級的輸出端負載及一個電感 (Lg)作匹配，以減少輸入端的匹配元件，可有效改善高頻的雜訊指數；最後加上一級源極追隨器(source follower)完成輸出阻抗匹配。這個寬頻低雜訊放大器量測結果如下：頻寬為3.1 ~ 10.6 GHz，平均增益為9.9 dB，雜訊指數為3.9 ~ 4.9 dB，輸入反射係數為 -7.7 ~ -12 dB，input P1dB最小值為-15.5dBm，IIP3最小值為-4.5dBm，功率消耗為51.3mW。

This thesis discusses the design and analysis of an ultra wideband low-noise amplifier. Resistive and capacitive loading with shunt-shunt feedback (LS-Cgd) can achieve input wideband matching. In order to obtain the wide-band gain, the shunt-series peaking inductor (Ld2-Lpk) is used to extend the bandwidth. A modified cascode structure is used to achieve the sufficient gain and isolation. In the meantime, the only one inductor (Lg) is used as input matching network, so the noise figure is good. The final stage is source follower for output matching. The UWB LNA measured result are as follows: The bandwidth is 3.1 ~ 10.6 GHz. The average gain is 9.9 dB. The noise figure is 3.9 ~ 4.9 dB. The input return loss is -7.7 ~ -12 dB. The input P1dB(min.) is -15.5dBm. The IIP3(min.) is -4.5dBm. The power consumption is 51.3 mW.