[SI-LIST] Re: ESD solution on antenna output

  • From: David Want <davew@xxxxxxxxxx>
  • To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 4 Feb 2004 15:23:36 +0000

 Charles,
I'm not sure there was enough information in the first place,like
the frequency of the transmitter for example which would give us an
idea of the component values. PCB layout issues also
may have a big impact as it would affect the routing of the
discharge current. It wasn't stated whether it
was a total failure of the tx to the ESD spike, or just a temporary
disruption. The solution may be different in each case.

As another idea to mitigate the problem, have better insulation on the
antenna.

Regards

David Want
VVLP Electronics Ltd
47 Percival Road  *  Rugby  *  Warwickshire  *  CV22 5JU
01788 541790                



Wednesday, February 4, 2004, 2:21:37 PM, you wrote:

> Irrespective of existing external antenna protection technology - it is
> worth remembering the original post and I quote:

> " My colleague (the designer) put it there to try and alleviate any
> potential ESD problems. I have found that I cannot solve the ESD
> susceptibility problem without removing it." 

> Hence the suggestions for sparkgaps/discharge tubes of course there
> are low capacitance "ESD" diodes used in USB2 that could also work.

> So - having restated the problem - any folks out there have any other
> ideas??


> Best Regards
> Charles Grasso
> Senior Compliance Engineer
> Echostar Communications Corp.
> Tel:  303-706-5467
> Fax: 303-799-6222
> Cell: 303-204-2974
> Email: charles.grasso@xxxxxxxxxxxx;  
> Email Alternate: chasgrasso@xxxxxxxx


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