Impedance-Controlled Routing | Online Documentation for Altium Products:
'via Blog this'
Saturday, October 31, 2015
Wednesday, October 28, 2015
Drill Drawing - Fab Drawing
How to create a fab drawing with drill charts for blind and through vias.
The example fab drawing shown below has four pages.
The pages frames and fab notes are not shown in the screen shots to hide confidential data.
Page 1 has the Stackup and Fab notes.
click on images to view
Page 2 has the Drill table and Drill Chart for Layer 1 to 16.
Page 3 has the Drill table and Drill Chart for Layer 1 to 8
Page 4 has the Drill table and Drill Chart for Layer 9 to 16
How it was done.
I used three mechanical layers to display the via symbols above the drill charts.
Note the drill table is placed only once on the Drill Drawing Layer in the design.
Outjob setup for PDF Fab Drawing with three drill tables and charts.
Example for Layer 1 to 8 blind vias.
Choose the drill layers Start = L1 and Last = L8.
Example for Layer 9 to 16 blind vias.
Choose the drill layers Start = L9 and Last = L16.
That's It !
The example fab drawing shown below has four pages.
The pages frames and fab notes are not shown in the screen shots to hide confidential data.
Page 1 has the Stackup and Fab notes.
click on images to view
Page 2 has the Drill table and Drill Chart for Layer 1 to 16.
Page 3 has the Drill table and Drill Chart for Layer 1 to 8
Page 4 has the Drill table and Drill Chart for Layer 9 to 16
I used three mechanical layers to display the via symbols above the drill charts.
Outjob setup for PDF Fab Drawing with three drill tables and charts.
Example for Layer 1 to 8 blind vias.
Choose the drill layers Start = L1 and Last = L8.
Example for Layer 9 to 16 blind vias.
Choose the drill layers Start = L9 and Last = L16.
That's It !
Thursday, October 8, 2015
Release Notes for Altium Designer Version 14.3.19
Release Notes for Altium Designer Version 14.3.19
Version 14.3.19 was released on Oct 6, 2015
'via Blog this'
Version 14.3.19 was released on Oct 6, 2015
'via Blog this'
Monday, September 28, 2015
CPW - Polygon's Arc Approximation
The arc approximation for polygons needs to be considered when creating Coplanar Waveguide controlled impedance traces (CPW).
click on images to view
The default Arc Approximation for Polygons is 0.5mil.
Example: The rules call for clearance of 13.6 mils
click on images to view (Gap = Pitch minus Width) = 13.6mils
The measured gap > Report > Measure Primitives
14,7 mils ?
Solution:
Reduce the Arc Approximation for the polygons poured adjacent to the CPW traces.
Re-pour the polygons and measure again.
Result 13.601mils.
Much better !
click on images to view
The default Arc Approximation for Polygons is 0.5mil.
Example: The rules call for clearance of 13.6 mils
click on images to view (Gap = Pitch minus Width) = 13.6mils
The measured gap > Report > Measure Primitives
14,7 mils ?
Solution:
Reduce the Arc Approximation for the polygons poured adjacent to the CPW traces.
Re-pour the polygons and measure again.
Result 13.601mils.
Much better !
Sunday, September 20, 2015
PCB: From-To-Editor (AD14 versus AD15)
Looking at the same net using the From-to-Editor
AD14.3.18 (length 1864 mils)
AD15.1.15 (length 1965 mils)
Why the difference ?
AD14.3.18 does NOT account for the length of the vias in the routed path.
AD15.1.15 does account for the length of the vias in the routed path.
This 100 mils is a very significant difference for high-speed designs.
Use AD15.1.15 or higher to account for the vias !
That's It.
AD14.3.18 (length 1864 mils)
AD15.1.15 (length 1965 mils)
Why the difference ?
AD14.3.18 does NOT account for the length of the vias in the routed path.
AD15.1.15 does account for the length of the vias in the routed path.
This 100 mils is a very significant difference for high-speed designs.
Use AD15.1.15 or higher to account for the vias !
That's It.
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