通信應用微分電路設計技術

　　在通信系統設計的主要挑戰之一是成功捕獲信號具有足夠的保真度。嚴格的標準規范要求適當的接口拓撲選擇。部署蜂窩電話的通信標準，如碼分多址（CDMA）和寬帶CDMA，需要高動態范圍，高輸入線性度和低噪聲，以避免阻斷劑的影響，信號失真，和靈敏度退化。在過去，完全差分信號鏈的性能優勢是捏造的單端選項，由于實際應用問題。然而，集成RF電路技術和可擴展的高性能差分RF積木的最新進展允許差分架構，以適用于高性能接收機設計。

　　A single-ended signal is unbalanced by definition and is measured by the difference between the signal of interest and a constant reference point， normally ground， which serves as the return path for the signal. A problem can be encountered if an error source is introduced to the single-ended signal. Since the ground reference will be unaffected by the injected error， the error is carried forward through the signal. In a single-ended configuration， any variation introduced to the desired signal will be problematic to remove without involving overly complex cancellation techniques. For this reason， single-ended or unbalanced signals are more prone to noise and interference， such as electro-magnetic coupled interference. Also， as will be shown later， unbalanced configurations have higher distortion than balanced circuits.