摘要
在高速电路中,由于寄生参数的影响,引发了一连串的信号完整性问题.微带线作为常用传输线,其信号完整性显得非常重要.文章研究了微带线的线路设计对信号完整性的影响,包括走线方式、线宽线距的比值及参考层的设计,并对比了阻焊油墨的类型和厚度对信号完整性的影响,为印制电路板(PCB)的设计及相关工艺提供一定的指导.该研究表明不同走线方式的微带线的插入损耗相差不大.线宽线距比从0.663增加到0.957,插入损耗明显增大.参考层不连续使插入损耗增加0.061 dB/in@12.9 GHz,0.023 dB/in@14 GHz.Low-DK阻焊油墨的插入损耗比常规油墨降低了0.163 dB/in@12.9 GHz,0.164 dB/in@14 GHz.43T丝网印刷比51T丝网印刷的插入损耗小0.047 dB/in@12.9 GHz,0.041 dB/in@14 GHz.
A serious of the problems of signal integrity occurred due to the parasitic parameters in a high—speed circuit.The signal integrity of the microstrip line plays a significant role on common line transmission.In this PaDer,the effects of the circuit designs of the microstrip line were investigated to find out the influ.ence on the signal integrity.The circuit designs ofthe microstrip line included the line ofwalking,line width/line spacing ratio,and the designs of the reference layer.In addition,the influence of the type and thickness of the solder resist ink on signal integrity was also analyzed to provide the guidance for the design and the related process of PCB.The study showed that the insertion loss of microstrip line in different walking lines was close.The insertion loss obviously increased as the ratio increased from 0.663 to 0.957.VV计ICn the reference layer was discontinuous,the insertion loss increased by 0.061 dB/in@12.9 GHz,0.023 dB/in@14 GHz.For solder resist ink,the insertion loss of low—Dk solder resist ink reduced by 0.1 63 dB/in@1 2.9 GHz,0.1 64 dB/in@1 4 GHz than traditional solder resist ink.And the insertion loss of 43T screen—printing was 0.047 dB/in@1 2.9 GHz,0.04 1 dB/in@1 4 GHz smaller than 5 I T screen—printing.
出处
《印制电路信息》
2017年第A02期9-17,共9页
Printed Circuit Information
基金
广东省应用型科技研发专项资金项目(No.2015B010127012)的资助.
作者简介
第一作者:徐小兰,研究生,师从何为教授,从事印制电路信号完整性方面的研发工作。
