Gerber format-Extended Gerber-custom pcb design

- Jan 04, 2017-

Gerber format-Extended Gerber-custom

pcb design

Extended Gerber

RS-274X, extended Gerber or X-Gerber, was released in December 2012, in a process known as the "The Great Reform".

It is a human readable ASCII format. It consists of a stream of commands generating an ordered stream of graphics objects. The graphics objects can be positive or negative. Superimposed in the correct order they create the final image.

A Gerber file contains the complete description of a PCB layer image without requiring any external files. It has all the imaging operators needed for a PCB image. Any aperture shape can be defined. Planes and pads can be specified without the need to paint or vector-fill as in Standard Gerber. (However painting is sometimes still used because implementations were created for Standard Gerber and have not yet been upgraded to use the more powerful capabilities of Extended Gerber.)

Attributes allow to add metadata to a Gerber file. Attributes are akin to labels providing information associated with image files, or features within them. Examples of metadata conveyed by attributes are:

  • The function of the file. Is the file the top solder mask, or the bottom copper layer, etc.?

  • The part represented by the file. Does it represent a single PCB, an array, a coupon?

  • The function of a pad. Is the flash is an SMD pad, or a via pad, or a fiducial, etc.

For more information about attributes see X2 FAQ or intro video in the external links.

An example of a Gerber file:

G04 Short version a file taken from the Example Job 1, created by Filip Vermeire, Ucamco*
%TF.FileFunction,Copper,Bot,L4*%
%TF.Part,Single*%
%FSLAX35Y35*%
%MOMM*%
%TA.AperFunction,Conductor*%
%ADD10C,0.15000*%
%TA.AperFunction,ViaPad*%
%ADD11C,0.75000*%
%TA.AperFunction,ComponentPad*%
%ADD12C,1.60000*%
%ADD13C,1.70000*%
%SRX1Y1I0.00000J0.00000*%
G01*
G75*
%LPD*%
D10*
X7664999Y3689998D02*
X8394995D01*
X8439999Y3734999D01*
X9369999D01*
D11*
X7664999Y3689998D03*
X8359999Y1874998D03*
X9882998Y3650498D03*
D12*
X4602988Y7841488D03*
D13*
X10729976Y2062988D03*
X10983976D03*
X11237976D03*
M02*

The format specification is published.


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