超寬頻射頻接收機包含了天線、濾波器（Filter）、低雜訊放大器（Low Noise Amplifier，LNA）、混波器（Mixer）、合成器（Synthesizer）、A/D轉換器（Converter）等電路。其中低雜訊放大器作為接收機前端電路的第一級，對整體電路的性能影響至關重要。
本論文所設計之低雜訊放大器採用了TSMC 0.18μm CMOS製程技術。為了使電路能應用于超寬頻，即操作在3.1GHz~10.6GHz頻段中，電路第一級採用了common-gate架構來做到寬頻的輸入匹配，電路第二級與第一級採用了current reused的架構來降低功耗，同時增大電路增益，電路還採用了電感進行擴展頻寬，最後採用源極隨耦器做輸出阻抗匹配。
為了使低雜訊放大器接雙平衡混波器，本論文還設計了主動Balun，將低雜訊放大器的單端輸出轉為雙端差動輸出。主動Balun採用的補償電容來降低雙端輸出的不匹配。同時為了便於量測，本論文還在Balun之後設計了緩衝器，使得輸出阻抗能夠匹配到50Ω。
電路晶片使用點探針進行量測，其量測結果顯示：在實際量測頻寬（2GHz~8GHz）內，S21參數為8~13dB，雜訊係數為6~8dB，IIP3為-13dBm；而雙端輸出的增益差小於3dB，相位差小於10°；電路全部功耗為23.1mW。

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