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Forum Thread Details
  • Replies 11 replies
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Related

RF ESD protection

nicoloquinte
nicoloquinte over 6 years ago

Hi,

I'm entering the beautiful world of RF design, and after looking into the documentation of the ublox NEO-6M module and saw this:


image

 

So because i know that my antenna is absolutely perfect (that isn't true but i'm proud of my qfh garbage)

I need to go with the inductance method since some manufacturers are saying that I should not go with a TVS because that's doing Bad things to the signal :

https://www.murata.com/products/emc/esd/sol_antenna_noise

 

So Do someone have any idea about how I can calculate the inductance

 

(BTW i wont connect my antenna directly to the RF-IN like this , i will do a little step of filtering)

 

Nico

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Top Replies

  • mcb1
    mcb1 over 6 years ago in reply to shabaz +3
    Usually you add an inductor to try and make the final stage think the antenna is matched, when in fact it isn't. Any mismatched antenna will not radiate 100%, so it's best to avoid them if you have low…
  • shabaz
    shabaz over 6 years ago in reply to mcb1 +3
    We did the same too : ) and test with a short burst, it was very cool hearing the relays clicking away, doing their ATU selection : ) I didn't look closely at what the module was, but guessed it was a…
  • shabaz
    shabaz over 6 years ago in reply to nicoloquinte +2
    Hi Nicolas, The part will be tiny (of the order of 1mm in dimensions) because of the capacitance mentioned earlier, that needs to be minimized, otherwise there will be no usable signal. 1mm is hand-solderable…
Parents
  • jw0752
    jw0752 over 6 years ago

    Hi Nicolas,

    Your image didn't post. You will have to use the picture icon in the tool bar so we can see what you are referring to.

    John

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  • jw0752
    jw0752 over 6 years ago

    Hi Nicolas,

    Your image didn't post. You will have to use the picture icon in the tool bar so we can see what you are referring to.

    John

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  • nicoloquinte
    nicoloquinte over 6 years ago in reply to jw0752

    Ok thanks

     

    https://www.u-blox.com/sites/default/files/products/documents/GPS-Antenna_AppNote_%28GPS-X-08014%29.pdf

    page 20 FIG 21

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