FreeLists / si-list / [SI-LIST] Re: ESD solution on antenna output

["Bart Bouma" <bart.bouma@xxxxxxxxx>]

Hi Ian,
I saw already several replies on your question, so I keep it short.
An inductor is not the ideal way to protect against ESD-pulses.
However, my experience is that an inductor can help to protect against 
surge pulses at antenna inputs (TV-tuners).

In your case, a low capacitance ESD protector (diode/varistor) is the best 
choice I think.
Look e.g. at  www.calmicro.com  (California Microdevices). They have low 
capacitance (1pF) ESD-protection devices.

best regards, Bart
www.yageo.com






Ian Barrett <Ibarrett@xxxxxxxxxxxxxx>

02-02-04 19:40
Sent by: si-list-bounce@xxxxxxxxxxxxx

Please respond to Ibarrett

 
        To:     "'davidjp@xxxxxxxxxxx'" <davidjp@xxxxxxxxxxx>
si-list@xxxxxxxxxxxxx
"'Pommerenke@xxxxxxxxxxx'" <Pommerenke@xxxxxxxxxxx>
        cc: 
        Subject:        [SI-LIST] ESD solution on antenna output
    Category: 



I am currently having a lively discussion with a colleague about an ESD
problem we have encountered. The trouble is I don't think either of us 
know
enough to be able to convince the other of our point of view.

The product is a small radio transmitter that is very susceptible to an 
ESD
spike applied directly to it's antenna. The design includes a small 
inductor
between the antenna output and ground. 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.

He claims 'any ESD experts will tell you to place this inductor' and wants
me to try and find another solution to the problem. But I think the 
inductor
is making the situation worse by coupling the ESD spike onto the ground
plane.

Can anyone offer some theory to back up either argument?

Ian.
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