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電池線路板廠如何減少高頻PCB電路布線串?dāng)_問題
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Update time : 2021-10-25 10:27:00
說到高頻電路布線，電池線路板廠的PCB工程師比較頭疼的，恐怕是高頻信號(hào)的串?dāng)_問題。那么，電池線路板廠如何減少高頻PCB電路布線串?dāng)_問題呢?
由于高頻信號(hào)是以電磁波的形式沿著傳輸線傳輸?shù)?，信?hào)線會(huì)起到天線的作用，電磁場的能量會(huì)在傳輸線的周圍發(fā)射，信號(hào)之間由于電磁場的相互耦合而產(chǎn)生不期望的噪聲信號(hào)稱為串?dāng)_。
為了減少高頻信號(hào)的串?dāng)_，電池線路板廠在布線的時(shí)候要求盡可能的做到：
1、在布線空間允許條件下，在串?dāng)_較嚴(yán)重的兩條線之間插入一條地線或地平面，可以起到隔離的作用而減少串?dāng)_。
2、當(dāng)信號(hào)線周圍的空間存在電磁場時(shí)，若無法避免平行分布，可在平行信號(hào)線的反面布置大面積“地”來大幅減少干擾。
3、在布線空間許可下，加大相鄰信號(hào)線間距，減小信號(hào)線的平行長度，時(shí)鐘線盡量與關(guān)鍵信號(hào)線垂直。
4、如果同一層內(nèi)的平行走線幾乎無法避免，在相鄰兩個(gè)層，走線方向務(wù)必為相互垂直。
5、在設(shè)計(jì)中，時(shí)鐘線宜用地線包圍起來并多打地線孔來減少分布電容，從而減少串?dāng)_。
6、高頻信號(hào)時(shí)鐘盡量使用低電壓差分時(shí)鐘信號(hào)并包地方式。
7、閑置不用的輸入端不要懸空，而是將其接地或接電源，因?yàn)閼铱盏木€有可能等效于發(fā)射天線，接地就能抑制發(fā)射。
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