第五章 結論與未來研究方向
5.2 未來研究方向
使用於 UWB 的跳頻式的 LNA 在於要能覆蓋整個 UWB 頻帶中的 14 個 Band，為了能達到覆蓋 14 個頻道的目的，可以使用[22][23]的 multi-tap inductor 搭配不同的 C 來得到不同的 LC 共振頻率，如 Figure 5.1.1 的示意圖。
Figure 5.1.1 使用 Lmulti來產生multi-band LNA
如以論文所提五組電容開關電路搭配 1 組 Ld可以得到 7 個共振頻 率點，則搭配 2 個輸出的 multi-tap inductor，至少便可以獲得 10 組以 上不同的LC 共振頻率，達到擴展頻道的目的，而對開關電路來說，使 用五組不同電容與電晶體所組成的開關電路來說，容易導致電路佈局 上過長的線路，因此可以考慮使用可變電容架構來減少硬體架構上的 開關電路，而改以電壓控制不同的電容值，並可以減少線路連接的長
度而降低離散效應的影響。除了晶片硬體設計上的改善之外，另外更 需要考慮的每個 model 之間的離散效應的影響，包括了離散電容，阻 抗以及電感效應都必須要小心，所以使用EDA tool 粹取出離散效應對 晶片設計是很重要的。
跳頻式的LNA 可以在信號接收下來後馬上進行濾波的動作，可以使得 信號通過 LNA，系統便可確定這是所需要的資訊而不會在受到其它信 號的影響，也可以達到避免干擾的目的更可以降低系統設計的複雜度。
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