第五章 量測結果
CHAPTER 6 Conclusion and Further work
第六章 結論與未來工作
6.1 結論
本論文主要探討『可變增益的低雜訊放大器( Variable Gain Low Noise Amplifier，VGLNA )』的電路設計，並透過電路軟體進行模擬、電路佈局，
之後透過 CIC 在 TSMC 進行 IC 下線的動作，最後 IC 送回並在本實驗室進 行量測與驗證的工作。
進行量測時，其實可事先預估實際量測的數值與當初電路模擬所獲得 的結果會有誤差，不論是頻率偏移的誤差或是相位偏移的誤差而或是振幅 大小所造成的總總誤差 …，這些誤差對電路的性能一定會造成一定的影 響，並進而降低電路整體的效能，因此在進行電路模擬時考慮的愈縝密，
思考的愈周詳是縮小電路模擬結果與實際量測數據之間差距的不二法門。
6.2 未來工作
此電路未來的改善工作除了透過電路元件間的微調( Fine tuning )使的 每一個增益級距(Gain Step)間能夠更接近 6dB 以外，進一步提升此電路的 功能且與其他的電路元件進行整合，都是兩個不錯且可以廣泛的去進行思 考的方向，接下來將針對此兩個方向去進行討論：
首先，針對可變增益分類進行討論；自動增益控制(Auto Gain Control，
AGC)之放大器(Amplifier)若以增益控制的方式進行分類，大致上可分成兩 類：第一類為可程式化增益控制放大器(Programmable Gain Amplifier，PGA) 此放大器其增益間級距是透過工作放大器(Operation Amplifier，OPA)或是 其他可程式化之元件來自動進行控制的，其特色為增益間級距較多且多於 中頻或低頻處使用；而另一類為可變增益放大器(Variable Gain Amplifier，
VGA)此放大器其增益間級距是藉由電壓源或是電流源之控制來改變其電 路整體增益，其特色為增益間級距較少但多使用於高頻，此兩類放大器之 差別在於一放大器必定有其頻率響應，而頻寬與增益之乘積為一常數，因 此我們在進行增益之控制時必須在頻寬與增益間進行取捨，也使得應用於 較高頻之增益控制放大器其增益級距較無法細分，而因此將其分成兩類。
而另一項可進行改善的方向為將此電路與其他的電路元件例如：濾波 器、混頻器或其他的電路元件逐一進行整合，進一步達到系統整合(System On Chip，SOC)的目標。
Reference
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