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This was the disconnect. Today they finally connected me with an RF focused sales guy at one of the shops. He said the same thing.
In general...
1. Don't specify impedance since they can't change any parameters.
2. Identify material that has tight tolerances. (He also mentioned Rogers for...
Thanks for the responses. I think I need to add more detail...
When I design a stackup using Hyperlynx or Genesys I plug in the dielectric constant of the prepreg from the data sheet. To make a 50 ohm impedance I then adjust either the height from the GND plane or the width of the traces...
Hello,
I'm just getting into analog RF design(L-band). I have done a lot of high speed digital stuff > 10Gb/s on differential pairs.
Typically we would call up the anticipated PCB manufacturer and get a stackup that they generated using their process and tools. For example 100 ohm...
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