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              PCB板厚不均勻

              時間:2015-4-28【打印此頁】 【返回

              真空層壓機,降低壓力減少流膠,盡量保持較多的樹脂量,因為樹脂影響εr,樹脂保存多些,εr會低些??刂茖訅汉穸裙?。因為PCB線路板板厚不均勻,就表明介質厚度變化,會影響Z0。

              嚴格按客戶要求的PCB線路板板材型號下料,型號下錯,εr不對,板厚錯,制造PCB過程全對,同樣報廢。因為Z0受εr影響大,成品多層板要盡量避免吸水,因為水的εr=75,對Z0會帶來很大的下降和不穩的效果。 

              PCB線路板板面的阻焊會使信號線的Z0值降低1~3Ω,理論上說阻焊厚度不宜太厚,事實上影響并不很大。銅導線表面所接觸的是空氣(εr=1),所以測得Z0值較高。但在阻焊后測Z0值會下降1~3Ω,原因是阻焊的εr為4.0,比空氣高出很多。 

              內層板務必找出導線缺口、凸口,對2GHZ高速訊號,即使0.05mm的缺口,也必須報廢;控制內層線寬和缺陷是關鍵。

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