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pcb layout設(shè)計(jì)流程

Release Time:2020-08-19 Edit the author:金致卓 Reading:7007
PCB板設(shè)計(jì)為整個(gè)工程項(xiàng)目的關(guān)鍵環(huán)節(jié),在進(jìn)行原理圖設(shè)計(jì),封裝設(shè)計(jì)之后,高 效的,正確的PCB板設(shè)計(jì)時(shí)確保設(shè)計(jì)功能實(shí)現(xiàn)的重要一步。那么如何進(jìn)行l(wèi)ayout設(shè)計(jì)呢?

首先需要準(zhǔn)備原理圖,原理圖封裝庫schlib,元件庫,PCB封裝pcblib等。有些元件的封裝在制圖軟件中是找不到的,所以就需要自己去建原理圖封裝,PCB封裝,關(guān)鍵在于器件的尺寸和PIN腳對(duì)應(yīng)。

第二,對(duì)PCB板進(jìn)行結(jié)構(gòu)設(shè)計(jì)。主要包括布線區(qū)域和螺絲孔,裝配孔等非布線區(qū)域的確定,確定layout的尺寸大小,為元器件,開關(guān)器件,接插件等進(jìn)行初步的layout。

第三,對(duì)PCB板進(jìn)行布局設(shè)計(jì)??梢韵仍谠韴D上生成網(wǎng)絡(luò)表,然后導(dǎo)入網(wǎng)絡(luò)表,導(dǎo)入PCB后可以看到飛線連接的PCB板,再進(jìn)行l(wèi)ayout設(shè)計(jì)。

第四,在布局layout完成之后進(jìn)行走線設(shè)計(jì)??梢赃M(jìn)行自動(dòng)布線,一鍵布線等抄作,但是往往自動(dòng)布線都不是很理想,不建議。一般都是自己手動(dòng)布線。

第五,布線要從幾個(gè)方面考慮。首先,布線得不通,杜絕有飛線情況。再者需要滿足電氣性能,達(dá)到預(yù)期的電氣特性。

第六,布線優(yōu)化和絲印設(shè)計(jì)。進(jìn)行布線優(yōu)化后,就可以進(jìn)行敷銅了。多層板還要注意鋪電源設(shè)計(jì)。

第七,檢查網(wǎng)絡(luò)和DRC規(guī)則,PCB結(jié)構(gòu)。出現(xiàn)rule violence說明網(wǎng)絡(luò),DRC規(guī)則存在問題,需要改正;出現(xiàn)warning,可以忽略,不過能解決zui好解決。

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