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CPWG trace widths and spaces

The Hittite document "Layout Guidelines For MMIC Components" is a great help but they only provide a single dielectric thickness, trace width, trace space and trace thickness combination that gives a 50ohm trace. It would be great to have a list of other combinations that work well with the various Rogers 4350 standard thicknesses. I noticed that many of the Hittite evaluation boards have trace widths and spaces that differ from the recommendations in the document but unfortunately the dielectric thickness and copper/plating thickness isn't mentioned so it is not so easy to duplicate.

Specifically I am looking for something that works well for a trace width of 15 to 20 mils (similar to what the HMC424 or HMC525 evaluation boards use).

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  • Hi Peter,

    Thru lines on the Hittite EVB`s sometimes also takes into account the PCB edge connector launch effects; hence PCBs are designed to compensate the mismatch introduced by the connector connection.

    That "Layout Guidelines For MMIC Components" is to provide a good starting point. For further analysis you can use simulation programs or freeware calculators. If you are using Rogers substrate, then Rogers Corp also provides a freeware for those calculations. Other substrate vendors like taconic or arlon may also be providing similar software.

    Best,

    Kagan

Reply
  • Hi Peter,

    Thru lines on the Hittite EVB`s sometimes also takes into account the PCB edge connector launch effects; hence PCBs are designed to compensate the mismatch introduced by the connector connection.

    That "Layout Guidelines For MMIC Components" is to provide a good starting point. For further analysis you can use simulation programs or freeware calculators. If you are using Rogers substrate, then Rogers Corp also provides a freeware for those calculations. Other substrate vendors like taconic or arlon may also be providing similar software.

    Best,

    Kagan

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