Hi to all,
I'm making a very special PCB board (USING CADENCE ALLEGRO PCB) in which I have rectangular pads of 20 um x 20 um. what is special with that board is that its substrate will be made by glass and it has just one metal layer. Now I have to design a circular shapes of 25 um as a diameter in order to superpose them exactly on the pads that I have, those circular shapes will be used later in a flip chip processing.
I was not able to make those circles, Allegro do not allow me to design such small ones :-(
Does any one has a an idea please
Thanks