From 4318d940602476dcad3719f635d5269431b585dd Mon Sep 17 00:00:00 2001 From: "J.P. Krauss" Date: Mon, 9 Mar 2026 07:43:07 -0700 Subject: [PATCH] Update Impedance Table Format --- notes/fabrication_notes.txt | 10 ++++++++-- notes/impedance_table.txt | 7 ++++--- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/notes/fabrication_notes.txt b/notes/fabrication_notes.txt index 07f4a2b..f5f9248 100644 --- a/notes/fabrication_notes.txt +++ b/notes/fabrication_notes.txt @@ -51,10 +51,16 @@ FABRICATION NOTES (UNLESS OTHERWISE SPECIFIED) #?stackup and impedance_controlled #?stackup and impedance_controlled -13) REFER TO IMPEDANCE TABLE FOR IMPEDANCE CONTROL REQUIREMENTS. +13) DIELECTRIC THICKNESS VALUES SPECIFIED IN THE STACKUP ARE + FOR REFERENCE ONLY. IMPEDANCE IS THE CONTROLLING PARAMETER + OVER LAYER STACKUP. GERBER DATA MAY NOT BE ALTERED EXCEPT + FOR STANDARD FABRICATION ALLOWANCES. + +#?stackup and impedance_controlled +14) REFER TO IMPEDANCE TABLE FOR IMPEDANCE CONTROL REQUIREMENTS. THE SUPPLIED ARTWORK MAY OR MAY NOT CONTAIN THE SPECIFIED TRACE GEOMETRIES ON EVERY LAYERS SPECIFIED. #?stackup and impedance_controlled #?stackup and impedance_controlled -14) CONFIRM SPACE WIDTHS AND SPACINGS. +15) CONFIRM SPACE WIDTHS AND SPACINGS. diff --git a/notes/impedance_table.txt b/notes/impedance_table.txt index d300651..3561c4d 100644 --- a/notes/impedance_table.txt +++ b/notes/impedance_table.txt @@ -1,3 +1,4 @@ -Transmission Line, Impedance [ohms], Tolerance [ohms], Layer, Trace Width [mil], Gap [mil], Ref. Layers -Single-Ended Microstrip, 50, ±10 %, L1, 13.75, N/A, L2 -Coplanar Differential Pair, 100, ±10 %, L1, 8.68, 8.00, L2 +Layer, Ref1, Ref2, Type, Impedance [ohms], Width [mil], Space [mil], Tolerance +L1, AIR, L2, SE, 50, 13.75, -----, 10% +L1, AIR, L2, DIFF, 90, 11.26, 8.00, 10% +L1, AIR, L2, DIFF, 100, 8.68, 8.00, 10%