# Calibration/De-embedding traces

**URL:** <https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414>\
**Category:** Design and Layout\
**Created:** [August 1, 2025, 5:00pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414 "2025-08-01T17:00:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tom.manning](https://avatars.discourse-cdn.com/v4/letter/t/aeb1de/32.png) [@tom.manning](https://sierraconnect.protoexpress.com/u/tom.manning)\
**Post date:** [August 1, 2025, 5:00pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414/1 "2025-08-01T17:00:58Z")

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This is not a performance question, but I’m working on a “high” frequency board out to 20GHz or so. I want copies of my input & output traces for calibration/de-embedding purposes. This board is small maybe 2x2", and I don’t need the calibration traces on every board, but maybe one per lot. Can this be done without creating another individual board schematic a layout?

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**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\
**Post date:** [August 4, 2025, 6:11pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414/2 "2025-08-04T18:11:18Z")

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This sounds like a coupon on a panel. Would a standard coupon work for you?  
If not, a second board might be required.

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<div class="post-metadata">

**Author:** ![tom.manning](https://avatars.discourse-cdn.com/v4/letter/t/aeb1de/32.png) [@tom.manning](https://sierraconnect.protoexpress.com/u/tom.manning)\
**Post date:** [August 4, 2025, 6:33pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414/3 "2025-08-04T18:33:23Z")

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Yes. Fab houses do create coupons for their TDR testing for characteristic impedance of course, but I recently learned one can also specify these coupons.

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<div class="post-metadata">

**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\
**Post date:** [August 4, 2025, 7:42pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414/4 "2025-08-04T19:42:42Z")

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If controlled impedance is requested the TDR specific coupon is automatically created on the panel.

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**Author:** ![atar.mittal](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/atar.mittal/32/49_2.png) [@atar.mittal](https://sierraconnect.protoexpress.com/u/atar.mittal)\
**Post date:** [August 4, 2025, 7:54pm UTC](https://sierraconnect.protoexpress.com/t/calibration-de-embedding-traces/3414/5 "2025-08-04T19:54:53Z")

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A special coupon can be added, but the customer will need to supply the art work. So, it likely would need another individual schematic and layout.