Hello,
I want to route high speed digital signals of 600 mhz and 6 ghz. datasheets and design guides strictly says it should be 100 ohms differential impedance. I also want to length matching them. I am using KiCAD, can't\won't use any other package.
I used 0.1 trace width and 0.2 spacing (i though it is 0.3 but it is actually 0.2). my PCB vendor is AllPCB and their 4-layer stackup shows pre-prep is 0.122mm of height
https://www.allpcb.com/4_layer_pcb.htmlI plugged these numbers in Kicad calculator and it showed like in attached picture.
I already routed these signals, was very tiresome to length match them!
please inform me what to do to achieve the requirements... and what is the best approach professional designers use in order to do it.
I mean, you don't design the board multiple times to be able to fit all PCB manufacturers with their different stackups right? or do you specify a custom stackup all the time if you are doing it for professional job.. and is it really much expensive?
does length matching has to do with this?
I had to put vias (0.3mm size) for nearly half of these diff. pairs... will this affect anything?
for your kind help!
NOTE: attached picture was for 0.3 gap which is not correct, correct one is 0.2mm. for 0.2mm kicad says Zodd= 68 ohms which is not going to be 100 ohms diff... i need it to be 50 ohms.
EDIT: I achieved 50 ohms Zodd by making 0.15mm width and 0.1mm spacing, but i feel these are too close and too small... is this correct to choose?
thanks!