Dear All,
I have been pondering back and forth about this for some time so am just going to open up a discussion and see where it goes.
Basically, best practices tell me that for off board connectors it is generally best to have a clean 0V hard tied to your chassis where you 'attempt' to dump noise the cable has picked up and tie this clean 0V at one point to your internal ground planes. This premise is based on trying to give the noise the shortest return path to the chassis such that it can return through whatever path it can find which is hopefully better than your cables.
Now let's shift this thought to an impedance matched 3GHz link. The microstrip/stripline impedance matching will always be heavily dependent on the GND/POWER planes. So in my mind as described in the previous paragraph, this would result in an interruption to the microstrip/stripline and perhaps introduce 'more' noise in the form of reflections. I guess I'm just curious how you all out there deal with very high frequency off board connectors in terms of 'best' EMC practices.
Many thanks in advance,
Skeeb
I have been pondering back and forth about this for some time so am just going to open up a discussion and see where it goes.
Basically, best practices tell me that for off board connectors it is generally best to have a clean 0V hard tied to your chassis where you 'attempt' to dump noise the cable has picked up and tie this clean 0V at one point to your internal ground planes. This premise is based on trying to give the noise the shortest return path to the chassis such that it can return through whatever path it can find which is hopefully better than your cables.
Now let's shift this thought to an impedance matched 3GHz link. The microstrip/stripline impedance matching will always be heavily dependent on the GND/POWER planes. So in my mind as described in the previous paragraph, this would result in an interruption to the microstrip/stripline and perhaps introduce 'more' noise in the form of reflections. I guess I'm just curious how you all out there deal with very high frequency off board connectors in terms of 'best' EMC practices.
Many thanks in advance,
Skeeb