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positive coppler plane and thermal pad in cadence 16.3

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yakex

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positive copper plane and thermal pad in cadence 16.3

For each layer of the padstack you can define a regular pad, an antipad, and a thermal pad.

I have a question: if the padstack passes through a positive plane and the pin or via using the padstack needs to be connected to the plane, what will be used then? regular pad? or thermal pad?

The following are well known to everyone.

1. In the printed circuit board design, Allegro uses the regular pad definition for a padstack when the padstack does not pass though a copper plane on a layer.

2. For a negative plane, if the padstack passes through a plane and the pin or via using the padstack needs to be connected to the plane, then the thermal definition is used.

3. If the padstack passes through a plane and the pin or via using the padstack does not need to be connected to the plane, then the anti-pad definition is used.
 

soodamanikannan

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Re: positive copper plane and thermal pad in cadence 16.3

For each layer of the padstack you can define a regular pad, an antipad, and a thermal pad.

I have a question: if the padstack passes through a positive plane and the pin or via using the padstack needs to be connected to the plane, what will be used then? regular pad? or thermal pad?

QUOTE]

Hi yakek,

In a positive plane you cant use thermla pad this condition is allero default. only we can use regular pad. but one more thing you need to indentify the which pads is linked with the power in the particulr layer you can use different pad shapes for power pin like squar, circular or oblong shapes.

---------- Post added at 05:55 ---------- Previous post was at 05:49 ----------

Hi,

manually draw the copper shape and draw the thermal symbol.
 

Scottm

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THe regular pad will be used and depending on what settings you have for the positive plane it will either add the spokes of the thermal connection or it will fully flood over the pad. The thermal pad in the padstack will only be used in negative planes.
 

Scottm

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yes soodamanikannan but you don't have to maually draw the thermals as allegro will do that for you depending on what you have set in global/local shape parameters.
 

yakex

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thank all of you!
 

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