一、丝印被遮挡覆盖,比如和过孔重叠,被元器件挡住、重合。例如:
![44e039fa5216486aac41dd78bfc5a5f2?from=pc.jpg 44e039fa5216486aac41dd78bfc5a5f2?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030xq46dkp6jbqx888q.jpg)
![cda96fc3a11d4013af40c88a673c8a66?from=pc.jpg cda96fc3a11d4013af40c88a673c8a66?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030fi5z25gzees2ie50.jpg)
![8c49fdffa9724d26b9634c9c2e6c4071.jpg 8c49fdffa9724d26b9634c9c2e6c4071.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030az4r55lfxolfhf5h.jpg)
![edd8fdc6dbc04850836ce294ef135afd?from=pc.jpg edd8fdc6dbc04850836ce294ef135afd?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030nzq4guk4o0gig4qz.jpg)
![faf9f386e13443eca7a9b58f82a7974d?from=pc.jpg faf9f386e13443eca7a9b58f82a7974d?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030qribbrkbr6ez36bc.jpg)
二、过孔、焊盘、走线间距太小,间距尽量设置大一些,相互之间有干扰:例如:
![d405b1640c044d0ebd7d5a1baf5c208f.jpg d405b1640c044d0ebd7d5a1baf5c208f.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030fzwqtwqtu99rcwcz.jpg)
![f83e4700978544a1ba713b9f82d097c4.jpg f83e4700978544a1ba713b9f82d097c4.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030fkvssz1vz5klts1s.jpg)
![a7fb0e66bf2a47f2afa7b5125298d459.jpg a7fb0e66bf2a47f2afa7b5125298d459.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030nzf4ccq06dcmqcz0.jpg)
![e085013d344543c4beabb4bbee803033?from=pc.jpg e085013d344543c4beabb4bbee803033?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030gykcmygzml97xals.jpg)
![c8cfa97ffd9d449b87a724a202b07310.jpg c8cfa97ffd9d449b87a724a202b07310.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030y8escjh1hb8mbrq2.jpg)
![0063df92369c4c8e96cb39426bf79c9e?from=pc.jpg 0063df92369c4c8e96cb39426bf79c9e?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030gocfvvvkffrn0lyy.jpg)
三、敷铜问题,在画PCB图时,我们按习惯一般只对GND进行铺铜,起到防护、散热、引流信号完整性要求、工艺生产要求。例如:
![3e794ed928994101b0b5edb6f452c653.jpg 3e794ed928994101b0b5edb6f452c653.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030bzw6tgbswse5zx3t.jpg)
四、敷铜尽量不出现“田”字形的铜皮例如:
![3a172dba2962449d80e6aced256e7390?from=pc.jpg 3a172dba2962449d80e6aced256e7390?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030fsossjpoo4rixjdb.jpg)
五、信号线、电源线等各类走线,不要弯弯曲曲各种大角度转弯,在保证安全间距的情况下、尽量不拐大弯,影响信号传输。特别是一些高频信号流的走线,一个偏差都会影响信号的传输,例如:
![9f505d625810416c9dafd4b34ec28eb9.jpg 9f505d625810416c9dafd4b34ec28eb9.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030wrk81rrdnprnnrk6.jpg)
![4b2dcfdc9b2e4bb3ab5d34d3c8fd9710.jpg 4b2dcfdc9b2e4bb3ab5d34d3c8fd9710.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030pk0csp1xzh5ef1z0.jpg)
![7194f2e6a6044af0bd72b26143ce0506?from=pc.jpg 7194f2e6a6044af0bd72b26143ce0506?from=pc.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030up5pup6dgkmtmpki.jpg)
![34164a9207aa47c09218efb32ae7a399.jpg 34164a9207aa47c09218efb32ae7a399.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030z9lsb9bhlh681l91.jpg)
![8a0f2b795f09410fbbea5462a37ac1b5.jpg 8a0f2b795f09410fbbea5462a37ac1b5.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030chrdwyo2w535drdw.jpg)
六、走线避免出现直角、锐角等现象,一般走钝角或者圆弧,同层一样,不同层也尽量包裹起来不出现直角锐角。还有尖角问题,会有尖角放电影响的问题,例如:
![5e5adcdb46324a8d97154031d9f9fb94.jpg 5e5adcdb46324a8d97154031d9f9fb94.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030fyxucx6eaeyghgrp.jpg)
![9ebedafa4170411d9d8a79fa67877fae.jpg 9ebedafa4170411d9d8a79fa67877fae.jpg](https://static.assets-stash.eet-china.com/forum/202109/22/150030bc9zkiusumssaulz.jpg)
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