What is the Formula for distance between Two Trace - Page 1
Forum section: electronics / beginners

author: Unknown
author_rank: Unknown
timestamp: December 18, 2014, 07:18:38 am
content: what is the formula for distance two trace worked on 3v3 ,one of them as signal and other is supply.how i calculate the distance between these two trace

author: Zero999
author_rank: Super Contributor
timestamp: December 18, 2014, 12:04:00 pm
content: There is no formula.If you're talking about a 3.3V the creapage distance is so tiny you won't be able to get a PCB reliably manufactured which will cause any problems with creapage.

author: KJDS
author_rank: Super Contributor
timestamp: December 18, 2014, 12:23:53 pm
content: and if you want to know how much coupling there is between them, then use Hammerstad and Jansens equations.

author: mikerj
author_rank: Super Contributor
timestamp: December 18, 2014, 12:33:27 pm
content: Possibly the most vague opening post I've ever seen.This might help, on the assumption you are worried about capacitive couplinghttp://www.edn.com/electronics-blogs/bakers-best/4426162/PCB-signal-coupling-can-be-a-problem

author: Unknown
author_rank: Unknown
timestamp: December 18, 2014, 12:43:00 pm
content: sir i have asked this questions in interview

author: Unknown
author_rank: Unknown
timestamp: December 18, 2014, 12:50:40 pm
content: thanks for your reply.and this is basic for miif i start routing 3V3 supply track and one signal track, i dont know what is the clearance between this two track.

author: wraper
author_rank: Unknown
timestamp: December 18, 2014, 12:51:18 pm
content: Quote from: ashish17 on December 18, 2014, 12:43:00 pm

author: wraper
author_rank: Unknown
timestamp: December 18, 2014, 12:57:29 pm
content: Quote from: ashish17 on December 18, 2014, 12:50:40 pmMinimum your pcb manufacturer allows if you are tight in space up to infinity, there is no formula. Of course if you don't do controlled impedance, however if you do, you need to know your target impedance first of all. And then it is not just distance to nearest track, but also pcb material and thickness, layers, track width, yada yada yada.

author: tggzzz
author_rank: Super Contributor
timestamp: December 18, 2014, 01:08:22 pm
content: Quote from: ashish17 on December 18, 2014, 12:43:00 pmI hope you mean you "have been asked this question in interview".In that case your response should have been to enquire "formula for what?", e.g. capacitance, impedance, coupling, maximum voltage, manufacturability, etc.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 18, 2014, 01:14:18 pm
content: Quite possibly, something has been lost in translation...

author: Simon
author_rank: Unknown
timestamp: December 18, 2014, 08:23:19 pm
content: Please do not post the same questionthree times!!!!

author: Jeroen3
author_rank: Super Contributor
timestamp: December 18, 2014, 08:33:12 pm
content: You can use the Saturn PCB Toolkit for all of your PCB related calculations.http://www.saturnpcb.com/pcb_toolkit.htm

author: dannyf
author_rank: Super Contributor
timestamp: December 18, 2014, 08:42:41 pm
content: QuoteX, where x is from -infinity to +infinity.

author: suicidaleggroll
author_rank: Super Contributor
timestamp: December 18, 2014, 09:51:21 pm
content: Quote from: ashish17 on December 18, 2014, 07:18:38 am42

author: Simon
author_rank: Unknown
timestamp: December 18, 2014, 10:02:50 pm
content: How many thousands of years did that take to work out ?

author: free_electron
author_rank: Super Contributor
timestamp: December 18, 2014, 10:09:09 pm
content: inner layer / outer layer ?humidity ?ambient air pressure ?covered with soldermask or open ?what noisemargin do you have ?what impedance is the signal supposed to see ?what core material do you use ?do i need to go on ?

author: dave_k
author_rank: Frequent Contributor
timestamp: December 19, 2014, 03:00:07 am
content: Quote from: ashish17 on December 18, 2014, 07:18:38 amIt's for same formula for working out how long is a piece of string.x = (d/2) * 2ie: twice the distance from one end to the middle.

author: suicidaleggroll
author_rank: Super Contributor
timestamp: December 19, 2014, 03:54:42 am
content: Quote from: Simon on December 18, 2014, 10:02:50 pm4000, of course.

author: DavidDLC
author_rank: Frequent Contributor
timestamp: December 19, 2014, 04:17:47 am
content: I start to dislike EEVBlog just for these type of comments your are making, the poster is trying to reach for help, maybe a problem with language ? and you come with stupid comments

author: zapta
author_rank: Super Contributor
timestamp: December 19, 2014, 07:15:17 am
content: Quote from: DavidDLC on December 19, 2014, 04:17:47 amWell said.

author: Simon
author_rank: Unknown
timestamp: December 19, 2014, 07:37:03 am
content: Quote from: DavidDLC on December 19, 2014, 04:17:47 amAnd it gets tiring when people join who are that childish that they have to post the same topic 3 times. I think the question was adequately answered, it has already been pointed out that for 3.3V there is no minimum as it will be well under the minimum clearance distance the pcb can be made to and others have asked for more detail but no reply.

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: December 19, 2014, 06:29:53 pm
content: Quote from: Simon on December 19, 2014, 07:37:03 amIsn't it quite likely he doesn't realise this? I think he has so much issues with the language he does not know exactly what he is saying, nor what the replies are trying to tell him. The attitude in many of the comments won't help with that either.

author: suicidaleggroll
author_rank: Super Contributor
timestamp: December 19, 2014, 08:20:55 pm
content: Quote from: TheUnnamedNewbie on December 19, 2014, 06:29:53 pmNothing will help with that, other than learning the language to a level at which he can form his question into a coherent sentence and understand and respond to questions presented to him.

author: Simon
author_rank: Unknown
timestamp: December 19, 2014, 10:31:53 pm
content: anyone with limited english and the need to make multiple identical posts will not get far on here. For one multiple posts asking the same question will get you banned and for second whatever your first language is i bet it's not even anyone elses 2nd, 3rd, or 4th. This is an english speaking forum after all.

author: Simon
author_rank: Unknown
timestamp: December 19, 2014, 10:33:12 pm
content: The account has also been limited pending approval probably by the automated spam detecting software so I think that puts the matter to bed, I knew i had a gut feeling about it

author: c4757p
author_rank: Super Contributor
timestamp: December 19, 2014, 10:45:34 pm
content: Quote from: Simon on December 19, 2014, 07:37:03 amQuote from: Simon on December 19, 2014, 10:31:53 pmDoesn't mean you all need to pile on him like a pack of school bullies.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 19, 2014, 10:55:49 pm
content: We (athttp://www.dutchforce.com/~eforum/index.php) had some concern over a recent new poster, very prolific, over 50 posts in a week or two (heck, that's more than I post here, I think??). Very similar: posting tons of really, really badly formed, vague questions. And giving no replies, initially. Not violating any obvious spam rules, but definitely beyond the norm. Eventually booted because the same bothersome posts were showing up elsewhere (and getting the same warm reception!).Tim

author: suicidaleggroll
author_rank: Super Contributor
timestamp: December 19, 2014, 11:04:40 pm
content: The OP's inability to effectively communicate and his overall behavior here (not responding to any requests for clarification, replying with the same vague question and no supporting information, starting multiple threads on the same topic, etc.) will get you quickly banned from almost any forum on the net. I don't understand why people are getting so offended by the responses here...

author: c4757p
author_rank: Super Contributor
timestamp: December 19, 2014, 11:07:32 pm
content: Thenjustban him. That's all that's necessary.

author: Simon
author_rank: Unknown
timestamp: December 19, 2014, 11:43:04 pm
content: Quote from: T3sl4co1l on December 19, 2014, 10:55:49 pmthey quietly create an innocent presence, get past any limitations on posting links based on post count and then put spam in their signature that takes effect on all of their posts retrospectively

author: Simon
author_rank: Unknown
timestamp: December 20, 2014, 02:10:04 pm
content: I'm not sure what you mean by publishing and minority reports. The best way of dealing with them if they get to that stage is that Dave as he overall admin deletes their account in which case there is an option to delete all posts and topics as well.