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 Community Search 

Page 1 of 18 (176 items) 1 | 2 | 3 | 4 | 5 | Next > | Last »
  • Re: Vias in Symbol
     I took a look at that app note, in the app note they talk about tenting the drill holes as a means to stop wicking of the solder paste, but if you are using 13Mil holes then tenting will be a challenge as the hole is so small. A better solution is to have the holes plated shut for small holes. There is a dis advantage to haveing mask ...
    Posted to PCB Design (Forum) by ScottCad on Sun, Apr 27 2014
  • Re: Vias in Symbol
    To answer your questions.The multi Drill option is used in a pad when more than one drill hole is needed. "Typical use is for a regulator tab" to remove heat to a plane.In a multi drill pad "There are no thermal vias" It is simply one pad with holes in it.Net connectivity is based on pin info in Allegro. So if the pin has a net ...
    Posted to PCB Design (Forum) by ScottCad on Sat, Apr 26 2014
  • Re: New VIA definition
    Your question pertains to the actual path to where vias and padstacks are located in Allegro so they can be re used in designs. Give this a try. To make it easy create a folder or directory on your harddrive, call it "Allegro_Vias" You can name it what you want. So we have a folder with a path c:\Allegro_vias Next we need to ...
    Posted to PCB Design (Forum) by ScottCad on Fri, Apr 18 2014
  • Re: A simple question about PCB antenna?
     I think it would be better to create the antenna as a footprint with it's own symbol in capture. Antenna design at microwave on a PCB substrate can be a challenge, did you have a particular s11 goal for the band of interest ?  To remove mask from a trace so the trace is exposed you can draw a shape over it on your pcb mask ...
    Posted to PCB Design (Forum) by ScottCad on Wed, Apr 9 2014
  • Re: Can't choose directory for netlist files
    See if this changes how it works. Right click on your capture icon and "run as an administrator" when launching capture. Scott 
    Posted to PCB Design (Forum) by ScottCad on Wed, Apr 9 2014
  • Re: Fillets(teardrops)
    Ron for small vias say 25 mil round or pads for that matter filllets serve a few purposes that come to mind. The first is they aid in the transition of high-speed clocks running down a trace to a load. A load can be a pin on a device. In particular high speed clocks running at 100''s of Mhz or more. The other thing is that on ...
    Posted to PCB Design (Forum) by ScottCad on Fri, Mar 21 2014
  • Re: How to set the diameter value of circle shape in Allegro
     RFStuff I dont use the 16.2 version but a later version, Perhaps someone can chime in and let you know how it is done in 16.2 Scott 
    Posted to PCB Design (Forum) by ScottCad on Wed, Mar 19 2014
  • Re: Vias in a symbol
     Ron The easy way to create a multi-drill padstack is to create the padstack first then choose the drill options you want. Give this a try. Open the pad designer and click on layers "Create a square padstack 200x200 mils" Go back to the parameters tab and choose a suitable drill size for the hole size you need. On the ...
    Posted to PCB Design (Forum) by ScottCad on Wed, Mar 19 2014
  • Re: Vias in a symbol
    Ron, There is another way to do what you are trying to do, I think it just might be a better way that does not use vias. For tabs on SMD regulators etc I creade a "MultiDrill" Padstack so no vias are needed. You can easily specify the number of holes you need and the spacing. Works pretty darn good. It also has the advantage that the ...
    Posted to PCB Design (Forum) by ScottCad on Sun, Mar 16 2014
  • Re: How to place multiple pins with particulat pitch in Allegro .
    Try this On the toolbar choose "Layout Pins" On the righthand side of the screen click on the options tab. Choose the padstack you want to us  Notice copy mode is rectangular and below it you can specify how many pins you want and the X, Y direction of the pins to be placed. "Spacing" is where you enter the pitch ...
    Posted to PCB Design (Forum) by ScottCad on Sun, Mar 16 2014
Page 1 of 18 (176 items) 1 | 2 | 3 | 4 | 5 | Next > | Last »