Tagged Questions
2
votes
4answers
827 views
How to specify 100 ohm impedance on a pcb gerber
I've been using Altium for several years when I've needed to designed boards. However it's all been for simple analog designs and never anything too technical. I'm now trying to take a jump into a ...
2
votes
2answers
353 views
How can I meet these PCB design conductivity/isolation requirements?
The specifications required are as follows:
The resistance between ground pins on a connector and the case (chassis) ground should be less than 3 Ohms.
The resistance between any other signal on the ...
6
votes
3answers
415 views
Controlled impedance in presence of vias and through-hole components (PTHs)
We have some controlled impedance traces on layer 4 of a board. Layer 3 is a GND plane. Layer 5 is a 3.3V plane. Both planes are unbroken (they occupy the entire layer), with the exception of vias and ...
1
vote
2answers
646 views
When does controlled impedance on a PCB matter?
Suppose I have a PCB that contains a microprocessor, or an FPGA (a "controller"). This "controller" drives a single-ended signal to an LVDS driver IC and a single-ended signal to a connector that goes ...
7
votes
2answers
717 views
Is paying extra for “Controlled Impedance” boards necessary?
I'm doing a bit of RF PCB design, and one of the things that caught my eye is the "Controlled Impedance" option. Checking more boxes always costs more, so I want to know if this is worth the extra ...
2
votes
1answer
491 views
Do I need to control trace impedance for DDR2 memory?
I am going to try to interface low-speed 8bit DDR2 chip to FPGA, and I've got some questions crucial to make it work :-)
3) What is up with controlled impedance of PCB traces? Why it's important? ...
