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ABB AXODYN DSR 3001 

ABB AXODYN DSR 3001  單端信號是相對于差分信號而言的，單端輸入指信號有一個參考端和一個信號端構成，參考端一般為地端。

  

  差分信號

  差分傳輸是一種信號傳輸?shù)募夹g，區(qū)別于傳統(tǒng)的一根信號線一根地線的做法（單端信號），差分傳輸在這兩根線上都傳輸信號，這兩個信號的振幅相等，相位相反。在這兩根線上傳輸?shù)男盘柧褪遣罘中盘枴?

  

  差分與單端信號比較

  差分信號與單端信號走線的做法相比，其優(yōu)缺點分別是：

  優(yōu)點

  1、抗干擾能力強。干擾噪聲一般會等值、同時的被加載到兩根信號線上，而其差值為0，即，噪聲對信號的邏輯意義不產生影響。

  2、能有效抑制電磁干擾（EMI）。由于兩根線靠得很近且信號幅值相等，這兩根線與地線之間的耦合電磁場的幅值也相等，同時他們的信號極性相反，其電磁場將相互抵消。因此對外界的電磁干擾也小。

  3、時序定位準確。差分信號的接受端是兩根線上的信號幅值之差發(fā)生正負跳變的點，作為判斷邏輯0/1跳變的點的。而普通單端信號以閾值電壓作為信號邏輯0/1的跳變點，受閾值電壓與信號幅值電壓之比的影響較大，不適合低幅度的信號。

  缺點

  若電路板的面積非常緊張，單端信號可以只有一根信號線，地線走地平面，而差分信號一定要走兩根等長、等寬、緊密靠近、且在同一層面的線。這樣的情況常常發(fā)生在芯片的管腳間距很小，以至于只能穿過一根走線的情況下。

  一、基本區(qū)別

  不說理論上的定義，說實際的。

  單端信號指的是用一個線傳輸?shù)男盘枺桓�沒參考點怎么會有信號呢？easy，參考點就是地啊。也就是說，單端信號是在一跟導線上傳輸?shù)呐c地之間的電平差。那么當你把信號從A點傳遞到B點的時候，有一個前提就是A點和B點的地電勢應該差不多是一樣的，為啥說差不多呢，后面再詳細說。

  差分信號指的是用兩根線傳輸?shù)男盘�，傳輸�(shù)氖莾筛盘栔g的電平差。當你把信號從A點傳遞到B點的時候，A點和B點的地電勢可以一樣也可以不一樣，但是A點和B點的地電勢差有一個范圍，超過這個范圍就會出問題了。

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