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TIDA-00380: TIDA-00380

Uzi Saltoon
Prodigy 80 points
Part Number: TIDA-00380

Hi,

I would like to manufacture a PCB according the gerbers.

What are the requirements for impedance matching?

Our Engineering department sent to to PCB manufacturer and got question about the impedance control.

The final target is to manufacture an accurate PCB without the need to do RF matching and get maximum performance. is it possible on first shot?

thanks

  • 0
    TI__Intellectual 1260 points

    Hi Saltoon,

    The details are mentioned in the altium CAD files are located at: https://www.ti.com/tool/TIDA-00380 

    Please refer to the fabrication notes for the impedance control (The trace thickness with spacing & stacking). Follow the layer stack up, also mentioned in the CAD files. 

    In Gerber the GM10 and GM12 layers has the fabrication notes and stack up details for the impedance control and that can be used by the fabricator. The Fabricator has to verify the impedance as per the their manufacturing details.

    Thanks,

    Manu

  • 0 in reply to Manu Balakrishnan
    Prodigy 80 points

    Hi Manu,

    Thanks for the answer.

    I saw that the gerber states 18mil for 50ohm. it doesn't mention the gap to GND as 4mil (co-planar).

    I asked my PCB manufacturer for 50ohm co-planar with 18mil and i got the attached structure with 20mil gap (polar screenshot) .

    Can you confirm it is ok? or any concern with this?

    The trace for SMA option is consistent as trace on top layer on reference GND in layer 2. [the option for chup antenna is different with the openning on all layers]

    thanks.

  • 0 in reply to Uzi Saltoon
    Prodigy 80 points

    Hi Manu,

    One more question - can you share how TI got 50hom with 18mil trace (and 4mil gap to GND)? maybe you have Polar screenshot of calculation?

    I'm not able to get same results.

    Thanks.

    Uzi

  • 0 in reply to Uzi Saltoon
    TI__Intellectual 1260 points

    Hi Uzi,

    I don't have the polar screen shot of the calculation. We did the impedance control as per the calculation and stack up from the fabricator. Looking at your calculation table, I see that the fabricator is confirming 50 ohm impedance, which is ok. I am checking whether I can get the opinion from a domain expert.

    Thanks,

    Manu