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trace pcb 在電子製造，工作狂人 Facebook 的最佳解答

2020-10-22 08:14:14 有 134 人按讚

《舊文複習》要找到這類CAF的不良現象還真不容易，首先得找出電路板出現短路現象的地方，然後把能割的線路都割斷，逐漸把可能發生短路現象的範圍縮小，最好要縮小到是那個通孔(via)對通孔，或是哪條線路(trace)對線路，甚至要量測出來是那一層銅箔短路，這樣切片(cross section)下去才有比較大的機會可以找到微短路的證據。

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電子製造，工作狂人

About author

此專頁由「工作熊」主持。在【電子製造業】打滾多年，分享 SMT、焊錫、塑膠射出、產品設計、瓦楞包裝…等經驗。不保證內容一定都正確，服用前請三思。

此專頁由「工作熊」主持。在【電子製造業】打滾多年，分享 SMT、焊錫、塑

社群媒體上有些相關的討論：

trace pcb 在 [問題] 請問有關PCB trace長度的問題~~ - 看板Electronics 的推薦與評價

作者alllice (alllice )

看板Electronics

標題[問題] 請問有關PCB trace長度的問題~~

時間Mon Jun 29 20:47:08 2009

大家好想請教各位一個問題
在研究SI問題的時候
有看過一個法則
是rising time與trace長度的關係
好像是rising time 1ns對應trace 1mil的長度
請問各位達人
這個法則是在解釋甚麼東西呢??
是說只要PCB板上的trace
訊號rising time=1ns時如果長度大於1mil
就需要考慮crosstalk或是termination??

另外請問大家
甚麼情形下須要考慮crosstalk或是termination呢??

非常謝謝大家的熱心回答唷^^

--

※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 118.168.96.32

→ duckj:rising time越快,組成其波形的諧波頻率越高,波長也愈短,衍 06/30 06:14

→ duckj:生的效應是高頻時的阻抗不匹配,所以phy內部有termination的 06/30 06:17

→ duckj:電路;crosstalk跟走線太近比較有關係,但LVDS的信號則是cross 06/30 06:22

→ duckj:talk耦合的方式傳遞.好像是這麼一回事^^ 06/30 06:24

推 pow:後面提到crosstalk和LVDS的地方有問題 06/30 08:19

→ pow:crosstalk一般是說其他不相干的信號線被干擾 06/30 08:20

→ pow:另外1mil長的trace 未免太短了吧你說1公分可能還有一點道理 06/30 08:22

→ pow:一般的die到packaging上面的bond wire都可能超過1 mil了 06/30 08:23

→ alllice:ㄏㄏ P大我搞錯了是1ns對應 1 inch線長 06/30 23:55

→ alllice:另外想再請教為什麼低頻的時候不用考慮這些效應?? 06/30 23:56

→ alllice:就是反射 crosstalk 之類的問題呢?? 06/30 23:56

推 pow:你的問題就是傳輸線相關效應最根本的問題 07/01 01:58

→ pow:答案就是波長元件長度相對於波長如果是1/10*波長以下 07/01 01:58

→ pow:可算是lump元件但是如果長度和波長差不多等級 07/01 01:59

→ pow:就必須考慮那些有的沒的波長和波速、頻率有關係 07/01 02:01

→ pow:所以人家才說高頻要注意那些 07/01 02:01

→ pow:實際上不是高頻而是波長 07/01 02:01

→ pow:高頻要考慮的比較像是loss那些 07/01 02:02

→ pow:數位信號用rise/fall edge來預估高頻成分然後說高頻限制最長 07/01 02:04

→ pow:線長其實是一樣的道理更簡單的算法是 07/01 02:05

→ pow:PCB(FR4)的relative permittivity大概是4 所以波速大概是c/2 07/01 02:06

→ pow:如果數位信號的rising edge是1ns 可算1ns之內波可以走xx公分 07/01 02:06

→ pow:那個xx數值除以10 「大概」就是你要考慮的長度 07/01 02:07

→ pow:有人除10 有人除20 有人除5 07/01 02:07

→ alllice:感謝P大超精闢的解說受益良多^^ 07/01 20:26

→ alllice:所以P大您的意思是說在數位訊號中要用上升時間 07/01 20:28

→ alllice:換算成的波長其十分之一來決定要考慮的長度是嗎?? 07/01 20:28

→ alllice:另外您提到的lumped元件是不是如果變成lumped元件 07/01 20:30

→ alllice:就不用考慮傳輸線那些效應了呢??傳輸線應該是分佈元件是嗎 07/01 20:31

→ alllice:不好意思觀念很薄弱再次感謝您的解惑^^ 07/01 20:31

→ alllice:再多問一下 ^^|| 為什麼可以用上升時間換成波長呢?? 07/01 20:47

→ alllice:是因為方波可以展開成無限多個奇次協波項 07/01 20:48

→ alllice:所以上升時間快的可以用高次的協波項來表示 07/01 20:49

→ alllice:是這樣的意思嗎??為什麼長度小於波長就可以忽略傳輸線 07/01 20:51

→ alllice:呢?? 這一點我還是沒有辦法很直觀的想出來.....:( 07/01 20:52

推 pow:lumped元件的假設就是你在這邊變另一邊也「同時」跟著變 07/01 23:13

→ pow:假如兩個點差距超過1/10波長表示你這邊變了另一邊會慢一點點 07/01 23:13

→ pow:電路圖裡面把兩個點連起來的branch假設是branch兩端同時變 07/01 23:14

→ pow:如果不同時變就是distributed... 07/01 23:14

→ pow:波長、頻率、展開都是用來量化解釋這個非同步的現象 07/01 23:16

→ sneak: 所以上升時間快的可以用 https://muxiv.com 11/11 15:13

→ sneak: 可算是lump元件但 https://noxiv.com 01/04 21:58

... <看更多>

trace pcb 在 EEVblog 1559 - PCB Design: Trace Current Rating - YouTube 的推薦與評價

Dave answers a Twitter question: How should I design a PCB trace to carry 80A of current, and can this be done on one PCB layer? ... <看更多>

trace pcb 在 PCB Design Considerations: Trace Width - YouTube 的推薦與評價

PCB Design Considerations: Trace Width https://www.pcbway.com/ Get 5 boards in about a week for $22! ... <看更多>

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A PCB trace forms the connecting bridge for various electrical signals—power, analog, or digital—between two junctions. Junctions can be an ...

#91. 製程能力- 興普科技股份有限公司

類別 Standard (標準) Advanced (高階) Maximum finished thickness (最大成品板厚) 5.0 mm 10.0 mm Board thickness tolerance (成品板厚公差) ±10% ±8% Maximum processed layer count (最大生產層數) 32L 40L

#92. ANSI IPC-2221A PCB Trace Width Calculator

ANSI PCB Trace Width Calculator. Help us improve these pages - If you have any comments about the content here or would like to see improvements or a ...

#93. How to ensure your PCB Trace Widths are Effective

PCB Expert, Sarah Santangelli takes us through the importance of Trace Widths and what they mean for your PCB design.

#94. [問題] 請問有關PCB trace長度的問題~~ - 看板Electronics

是說只要PCB板上的trace 訊號rising time=1ns時如果長度大於1mil 就需要考慮crosstalk或是termination?? 另外請問大家甚麼情形下須要考慮crosstalk或 ...

#95. Pcb Trace 中文 BIAV0N - KitaKompeten

TRACE PCB Design Ltd. Follows new manufacturing technologies, is. Routing PCB traces is one of the most important aspects of PCB design and layout.

#96. R, L, C, and a PCB Trace Impedance Measurement and ...