VLT5032PT5C20STR0D0F00A00C0

VLT5032PT5C20STR0D0F00A00C0

：（同號）/，
 
公司銷售的進(jìn)口備件從國外生產(chǎn)廠家直接進(jìn)貨，

實行扁平化的銷售模式，給客戶節(jié)約了時間和成本。

我們的目標(biāo)就是國內(nèi)用戶采購國外備件遇到困難和疑難時都能找到我們。

我們能夠及時地報出優(yōu)惠的價格和迅捷的交貨期；國內(nèi)用戶采購國外備件受到*代理壟斷價格時，

我們會給用戶提供一個比較的機(jī)會，并且為客戶提供解決方案。由于我們的訂單集中，訂貨量大，

因此我們能提供頗具競爭力的價格并能夠迅速交貨，我們*以來致力于解決國內(nèi)用戶采購國外備件中的疑難問題，

并為廣大用戶提供電氣及工控自動化成套設(shè)備的購銷、現(xiàn)場調(diào)試等全面周到的服務(wù)。

 
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*種模擬/數(shù)字布局是通過模擬部分連接數(shù)字部分的5V和接地端。在這種配置下，LED的大電流、電機(jī)的切換和數(shù)字控制器的噪聲覆蓋在敏感的模擬電源和接地路徑之上（見圖6a）。PCB走線上的噪聲路徑就是與走線阻抗和電感相互作用的電源和接地電流。這引起電路模擬部分的電源和接地的AC偏移。迅速解決這個題目的方案是把電源和接地走線重新布局，以便模擬和數(shù)字走線各自獨(dú)立，再一起連到一個中心位置。在這個中心位置上，把它們連接起來（見圖6b）。這種策略利用了走線阻抗、電感和旁路電容器，在電源和接地走線上建立了RC和LC低通濾波器。這樣進(jìn)一步把設(shè)計中的敏感部分與噪聲隔開。VLT5032PT5C20STR0D0F00A00C0

需要考慮的主要輻射噪聲是LED走線（它攜帶大電流）、RS-232接口中的電荷泵（它能夠吸收一定的電流），以及來自微控制器的I/O（具有快速上升時間）。LED和RS-232的驅(qū)動器走線會把噪聲電感耦合到緊貼電路板的鄰近走線上。這種耦合作用的表現(xiàn)即為電壓噪聲。來自微控制器的快速上升時間信號電容耦合到高阻抗且敏感的走線上。假如走線過于緊密，這種耦合作用就會表現(xiàn)為電流噪聲。

假如在電路布局中考慮了這些因素，從噪聲數(shù)字部分到敏感的模擬部分的噪聲耦合就會減少。這個新布局的模擬電路保持不變，大多數(shù)數(shù)字電路的布局也同樣如此。區(qū)別在于現(xiàn)在LED走線是繞過模擬電路而非穿過。RS-232接口的電源和接地也與電路板上敏感的模擬和數(shù)字功能分隔開。圖6b的電源和接地策略可用于指導(dǎo)布局。

結(jié)語

抑制模擬噪聲的*步是選擇低噪聲模擬元件。可以用濾波器消除信號和電源中的噪聲。還應(yīng)該適當(dāng)使用膺頻濾波器。在電源母線中，必要時可使用旁路電容器和電感線圈。同時，要利用接地層。

當(dāng)添加數(shù)字電路時，要為整個電路制定一個接地和電源策略。需要結(jié)合穿過各個路徑的電流密度來考慮走線的阻抗和電感。合成布局的目標(biāo)是zui大限度地減少路徑噪聲，例如走線之間耦合的電容和電感，同時利用走線的電感和阻抗與旁路電容器一道，減少并隔離噪聲。

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