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Re: Traces and Via's
Hi Budda
It is true that the impedance of the trace depends on the width/height above the plane also the dielectric constant.
if you are designing baords upto 6 -10 layers, all you have to do is specify the board shop that you want 50 ohms or 60 ohms for a particular...
trace recommendations fbga
hi
it depends on what kind of board,
a 0.8mm bga is a bad idea for any design
expect,
1. a shit load of cross-talk
2. DFM and DFA issues
3. High price tag for manufacturing
you cannot place a 0402 package between those pins,
you can do that provided,
1. use...
hi
I don't use pcad
but any decent pcb tool should allow you to do the following trick
1. create a new layer top_solder_mask or bot_solder_mask
2. or use one if you already have (allegro has one on geometry/package_gometry)
now create a desired shape in the layers specified above where you...
go around the command
select the desired buses and then create a bundle with the selected
ex
select class add*
; use wild card to select multiple objects P0_addXX and P1_addXX can be selected by using p?_add*
define (bundle bundle1 (nets (selected)) (gap 15 (layer INT1_LAYER4 INT2_LAYER5...
hi
these are some links in the web where you can read about the generic practices and procedures for DFT implementation.
**broken link removed**
**broken link removed**
https://www.mentor.com/dft/products.html
it is best to ask your fab and assembly vendor regarding their capabilities and...
Re: re:re: Specctr@ strange behaviour
Hi asena
Specctra is truly a powerful autorouter, the trick is to know how to drive it properly.
I understand ur frustuation.
there are several places in the internet like this as well as an official forum at www.specctraquest.com where you can sign up...
hi
I use mm while creating component foot-prints which are
0.5 mm, 0.65 mm, 1mm apart
and use mils while routing them
the disdavantage with the combination of both units is that you will have conversation error
ex, mil has an accuracy of 5:2 where as mm can go to 2:4
allegro now won't allow...
hi
you have to protect your vias after fanout use this commands
#********** FANOUT CYCLE **********
fanout 5(pintype all)(direction out)(share_len 25)(pin_share off) (smd_share off )(via_share on (maximum_connections 2))(max_len 150)
#********** PROTECT FANOUTS **********
protect all wires (...
pcb paste layer
hi cyberrat
thx for the corrections and detailed explanation
I never created a glue layer, i use paste layer for stencils
regards
merry xmas and happy new year to all
solder paste layer
TOP ASSY
Assy - Assembly layer
This is used for the assembly people who place and solder the components. This is similar to silk-screen print but it may include the pins of the component and large reference designator for easy identification.
TOP PASTE
This gerber is used...
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