Technical Editor Paul Rako looks at analog technology in power supplies, interface, the signal path, and life in general.
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Blog
Thursday, October 15, 2009
Connectors are an EMI signal integrity problem
Oct 15 2009 5:39PM | Permalink |Comments (3) |
There is a good article by William Kimmel and Daryl Gerke in Evaluation Engineering about EMI (electro magnetic interference) caused by the connectors in your system. Well worth a read. EDN contributor Eric Bogatin has an article on the same subject over at PCB Design. EMI is always both an electrical and mechanical problem. Because it crosses department boundaries it can turn into a political nightmare. Just make sure you understand all the issues and save your company from the whole blame game.
Related entries in: Analog |
Reader Comments
at 10/15/2009 10:02:39 PM, Andy T said:
Silly me - I thought EMI was due to those electron thingies running around in loops and up and down antenna kinds of structures, not the connectors. It's a mechanical problem alright - stubborn mechanical engineer is usually the problem.....
at 10/22/2009 2:17:41 PM, Mr.Carrot74 said:
The possibility that the affected people are impaired only in recursion is a non-starter. ,
at 10/27/2009 2:45:29 PM, Phil Ouellette said:
The mechanical package can have a huge impact on how easy or difficult it is to meet EMI/EMC compliance requirements in a design.
I have been handed more no-win EMC issues than I want to remember by mechanical designs that force the location of cable connectors or grounding screw holes to the wrong place on a PCB.
What to see a classic connector caused EMC problem? Google "Pin 1 Problem" and see why generations (as in tens of years) worth of audio gear had to fight hum problems even though they were using shielded, low impedance, twisted pair, balanced connections (which is as good as it gets). The incredible amount of trouble and expense audio engineers used to have to put up with to get rid of hum, and all because of a stinking connector.
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