- 1、本文档共78页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
高速PCB技巧_2008.ppt
A Practical Guide to High-Speed Printed Circuit Board Layout Agenda Overview Schematic Location, location, location Trust no one Power supply bypassing Parasitics Ground and power planes Packaging RF Signal routing and shielding Checking the layout Summary Overview PCB layout is one of the last steps in the design process and often one of the most critical High-speed circuit performance is heavily dependant on layout A high-performance design can be rendered useless due to a poor or sloppy layout Today’s presentation will help: Improve the layout process Ensure expected circuit performance is achieved Reduce design time Lower cost Lower stress for you and the PCB designer Schematic Schematic The strength of any structure (including PCB’s) is only as good as the foundation on which it built upon! A good layout starts with a good Schematic! Schematic flow and content Include as much information as you can What should you include? Items to Include on a Schematic Notes Component tolerances and case sizes Part numbers (internal/external/alternative) Board stack up Tests or alignment procedures Power dissipation Controlled impedance and line matching Component de-rating Thermal requirements Keep outs Mechanical considerations Critical component placement Warning flags What ever else you can think of! Schematic Location, location, location! Location, Location, Location Just as in real estate location is everything! Input/output and power connections are typically defined…Everything else is undefined Critical component placement Signal routing Circuit and component proximity Trust No One Trust No One If you’re doing your own layout, that’s one thing. If you’re not …. Trust No One If you’re doing your own layout, that’s one thing. If you’re not …. Don’t assume the CAD group is going to read your mind and get it right! Trust No One If you’re doing your own layout, that’s one thing. If you’re not …. Don’t assume the CAD group is going to read your
文档评论(0)