PCB Impedance calculator

[mishrashashi]

Hi,
I'm looking for a tool, which can calculate impdance for all the nets on board. Presently, I'm using allegro16.3 for design. I need to verify all signals impedance. I can do it manually but it consumes time. I need a tool... Plz help.

 

[buenos]

you need to do it manually.

 

[loosemoose]

Hyperlinx from Mentor.

 

[mishrashashi]

Thanks Loosesome,
But I dnt have hyperlynx tool. As per my knowledge, Hyperlynx is for SI analysis and it needs IBIS models to veryfy nets. It is difficult to get all components ibis model .
currently I'm doing it manually

 

[shivrajawat]

Hi,
Just Try "Saturn PCB Design" tool (FreeWare). as i think it can do.

 

[loosemoose]

Hyperlinks can do all the things you asked. But unfortunately it is a very expensive tool.
I thought Cadence does have a tool as well?! May not come with Allegro.
You should look for free tools !!

 

[shivrajawat]

Here is the link

https://saturnpcb.com/pcb_toolkit.htm

 

[mishrashashi]

Hi,
Just Try "Saturn PCB Design" tool (FreeWare). as i think it can do.

I'hv already checked on Saturn PCB Design tool. It checks a trace layer wise. Stripline and microstriplines are calculated individually. My problem is to calculate overall impedance (independent of layer stackup topologies). If a net has 4 microstripline and 3 stripline of different impedances for the same net, then what will be the actual impedance of the net ?

---------- Post added at 12:15 ---------- Previous post was at 12:07 ----------

Hyperlinks can do all the things you asked. But unfortunately it is a very expensive tool.
I thought Cadence does have a tool as well?! May not come with Allegro.
You should look for free tools !!

Ya, I checked allegro. it doesn't has the tool I'm looking for. Please tell me the Cadence tool name for impedance calculator if you know.

 

[marce]

! each line will have its own impedance as seen by the signal wavefront as the signal propogates down the line...What do you want to achieve?

 

[mishrashashi]

Hi Marce,
I have to make report for 4 different data bytes DDR3, to make sure that each signal bit trace has same impedance. Manually calculation is bit tough...

 

[marce]

Better off using signal integrity software for that task.

 

[mishrashashi]

Thanks Marc, even Loosesome also has suggested for the same. I'll try to get suggested signal intigrity tool.

 

[faiz_jho]

I'hv already checked on Saturn PCB Design tool. It checks a trace layer wise. Stripline and microstriplines are calculated individually. My problem is to calculate overall impedance (independent of layer stackup topologies). If a net has 4 microstripline and 3 stripline of different impedances for the same net, then what will be the actual impedance of the net ?

---------- Post added at 12:15 ---------- Previous post was at 12:07 ----------



Ya, I checked allegro. it doesn't has the tool I'm looking for. Please tell me the Cadence tool name for impedance calculator if you know.

Hi Marce,
I have to make report for 4 different data bytes DDR3, to make sure that each signal bit trace has same impedance. Manually calculation is bit tough...

Hi,
I think you cannot get the average impedance result from a line that has 4 microstrip & 3 stripline. Cadence will display it separately, you can open the SigXplor on Cadence. You will get the value separately on each segment.
If you drawing a system like that, I think you just have to draw it identically. Measure just one line and copy it for other line. In high speed you have to check the trace length also.. :-D