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The Cadence Allegro Viewer does not include DbDoctor. You need a Cadense Allegro License if you want to update your design to the latest
version/format.
We have experienced the same problem, but there is a simple solution. Use an old version of the Cadence Allegro Viewer!
In this case...
There is no simple answer to this. There are several factors that play a role here.
The number of layers and the required finished board thickness.
The pcb material and it Dk.
Required trace widths (manufacturing) and thickness
You can play around with the numbers in Saturns "PCB Toolkit".
My two cents;
IPC-2221, Generic Standard on Printed Board Design
IPC-4101, Specification for Base Materials for Rigid and Multilayer Boards
IPC-7251, Generic Requirements for Through-Hole Design and Land Pattern Standard
IPC-7351, General Requirements for Surface Mount Design and Land Pattern...
Simply use your fabricator's recommendations on width/spacings. Most of them have this available as a download.
Have a look at the attached file. (as an example)
Looks like a missing file to me. Slotted holes are not in the drill file. It is a separate file. If you do not supply that file, you won't get the slots.
we have had the exact same situation.
Turn on the soldermask layer, what you see is what you not get!
iow, in most cases soldermak is show as a negative layer, you see the openings in the mask
Length matching will only work when the signals are on the same layer (or very slow). In all other cases you have to use Time Of Flight (TOF) as Marce already indicated.
A Microvia is basically a very small via. Most PCBs now days are multi-layer boards. Vias are used to make connections between each layer of the printed circuit board. Microvias, as the name suggests have a smaller diameter and thus take up less board real estate and leave more space for...
In general, from an EMI view, it is not a good practice to put a signal layer between the PWR and GND plane.
The energy is not in the copper, remember. It is between the planes,
For high speed signals this can be the root cause for problems.
The closer the two planes are, the higher the...
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