通信應(yīng)用微分電路設(shè)計(jì)技術(shù)

　　通信應(yīng)用微分電路設(shè)計(jì)技術(shù)

　　在通信系統(tǒng)設(shè)計(jì)的主要挑戰(zhàn)之一是成功捕獲信號(hào)具有足夠的保真度。嚴(yán)格的標(biāo)準(zhǔn)規(guī)范要求適當(dāng)?shù)?a target='_blank' class='arckwlink_none'>接口拓?fù)溥x擇。部署蜂窩電話的通信標(biāo)準(zhǔn)，如碼分多址（CDMA）和寬帶CDMA，需要高動(dòng)態(tài)范圍，高輸入線性度和低噪聲，以避免阻斷劑的影響，信號(hào)失真，和靈敏度退化。在過(guò)去，完全差分信號(hào)鏈的性能優(yōu)勢(shì)是捏造的單端選項(xiàng)，由于實(shí)際應(yīng)用問(wèn)題。然而，集成RF電路技術(shù)和可擴(kuò)展的高性能差分RF積木的最新進(jìn)展允許差分架構(gòu)，以適用于高性能接收機(jī)設(shè)計(jì)。

　　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.