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Reg:Negative Artwork in Allegro

Sakthivel

Hi,

   I am using Allegro PCB Editor. What is the meaning if we set the negative artwork while defining the cross section of layers (through setup-cross section). Is it mean that negative artwork is generated while gerbar file creation or else what ever we see on that layer will not come in  the actual PCB like Orcadlayout?

   Plane layers to be definied negative or postive Artwork? If we define as negative layer (through setup-crosssection)  is it mean that where ever we define the copper, won't come on real PCB and viceversa?

    

Thanks in advance,

 Regards,

Sakthivel

Ucal Fuel Systems.

 

 

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  • mcatramb91

    Normally, the Plot Mode is always set to "Positive" with the only exception being on Negative plane layers so the gerber is generated in a reverse image. (Copper = Clear and Void of Copper = Solid)

    Basically, if there are traces on the layer then the Plot mode will be "Positive" and if you have dedicated power and ground planes which are Negative with Thermal Reliefs which are driven by Padstacks Thermal Flash definitions then its Plot Mode should be "Negative".

    Hope this helps,
    Michael Catrambone
    UTStarcom, Inc.

Reply
  • mcatramb91

    Normally, the Plot Mode is always set to "Positive" with the only exception being on Negative plane layers so the gerber is generated in a reverse image. (Copper = Clear and Void of Copper = Solid)

    Basically, if there are traces on the layer then the Plot mode will be "Positive" and if you have dedicated power and ground planes which are Negative with Thermal Reliefs which are driven by Padstacks Thermal Flash definitions then its Plot Mode should be "Negative".

    Hope this helps,
    Michael Catrambone
    UTStarcom, Inc.

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