内层干膜前处理对插入损耗的影响  

The effect of inner dry film pretreatment on insertion loss

作　　者：高冠正 房兰霞 GAO Guanzheng;FANG Lanxia(Shanghai Meadville Science&Technology Co.,Ltd.,Shanghai 201613,China)

机构地区：[1]上海美维科技有限公司,上海201613

出　　处：《印制电路信息》2023年第11期18-21,共4页Printed Circuit Information

摘　　要：传输线插入损耗(插损)是高频/高速印制电路板(PCB)的信号完整性关键指标,导体损耗受趋肤效应的影响,信号在粗糙范围传输,传输信号的驻波、反射将越来越严重,并导致信号传输路径变长,增加损耗。现有PCB工艺会导致铜箔表面粗糙度增加。为解决这个问题,市面上推出了低粗糙度层压前处理药水来代替常规棕化。在常规棕化流程中,内层干膜前处理对铜面粗糙度的贡献可以忽略,但在低粗糙度层压前处理流程中,内层干膜前处理所造成的铜面粗糙度对插损有较大的影响。研究了中粗化内层干膜前处理与超粗化内层干膜前处理对插损的影响,研究表明,中粗化干膜前处理搭配低粗糙度层压前处理可以更好地提升产品的电性能。The insertion loss(IL)of the transmission line is a key indicator of signal integrity of high-frequency/high-speed printed circuit boards(PCBs).The conductor loss is affected by the"skin effect".When the signal is transmitted in the rough range,the standing wave and reflection of the transmission signal will become more and more serious,leading to longer signal transmission path and increased insertion loss.The existing PCB process can lead to an increase in surface roughness of copper foil.In order to address this issue,low roughness lamination pretreatment chemical has been introduced on the market to replace conventional brown oxide.In the conventional browning process,the contribution of inner layer dry film pretreatment to copper surface roughness can be ignored,but in the low roughness lamination pretreatment process,the copper surface roughness caused by inner layer dry film pretreatment has a significant impact on insertion loss.This article mainly studies the effects of medium roughening inner layer dry film pretreatment and super roughening inner layer dry film pretreatment on insertion loss.The results show that medium roughening inner layer dry film pretreatment combined with low roughness lamination pretreatment could improve the electrical properties of products better.

关 键 词：信号完整性 趋肤效应 插入损耗 中粗化 超粗化 

分 类 号：TN41[电子电信—微电子学与固体电子学]