Hi Yurity Thanks for your paper. below is my understanding: 1. For microstrips. your suggestion is use of arcs with smaller angles and no length compensation 2. For strip line. It can be done with the serpentines or big loops. Both of them are work well. And with your suggestion. I check the SDC11, SDC22 (near-end mode transformation) and SDC12, SDC21(far-end mode transformation). There is also no much difference between Single loop and small serpentines for strip line. So I still don't know why most the design guide force to use small serpentines? Design guide is just a guide. Not Spec. Best Regards William Wu www.pcbtime.com ----- 原始邮件 ----- 发件人:"Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx> 收件人:<stefan.milnor@xxxxxxxxxxxxxx>, <rhaller@xxxxxxxxxxxxx>, <pcbtime@xxxxxxxx>, "'si-list'" <si-list@xxxxxxxxxxxxx> 主题:[SI-LIST] Re: delay tuning method of differential pair 日期:2013年11月20日 05点31分------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu