Need = 30 Mhz 16x16

Question

Hi,
Looking for PXI   16x16 1-wire  with <= 0.5Ω and enough bandwidth to carry a true -3Db 10Mhz with multiple switch closures  say 3 on a row.  It would be nice if it fit in a normal slot (I think 1U).   I am aware of the 2532b but not only is it way more than what we need, it is huge 3U and we would have to have a separate rack also its switch impedance is higher than what we would like.
We really need a minimum of 10Mhz which is why I have been looking at 40Mhz and above so that when we use multiple switches we can still get the bandwidth.  

Answer 1

Tell us more about your source and DUT.  Are they 50Ω?  I imagine that with a 500mΩ requirement, they're not.  Thus, we'll have incident reflections from your source into our matrix, through our matrix, and again as we leave our matrix.  Each additional source/load you connect at the same time will complicate matters further.
If you're attempting to pass a 10MHz sine wave through our switch (the analog definition of BW), then you should expect variable attenuation and (possibly severe) reflections, depending on how many DUTs you connect simultaneously.
When SI is important on faster signals, I typically recommend a blocking matrix design.  Blocking matrices allow NxN connections well into the GHz, but unfortunately, only allow one connection on any particular path.  Take a peak at this KnowledgeBase I wrote for an overview.
Of course, 10MHz isn't typically fast enough for me to recommend a blocking matrix, but when said matrix is 16x16, that warrants more consideration.  If you can use a smaller matrix, I'd recommend the PXI-2541, which is 8x12.  Note: You can expand the matrix to 8x24, 8x36, etc, with multiple modules, but this will also affect BW. 
How do we overcome all the stubs?  Glad you asked!  Inside the 2541, we've got a bunch of smaller 2x4 interleaved matrices, thus reducing the stub length.  However, all those additional relays certainly increase the ESR: 2.1Ω.
You might ask "But I don't need 300MHz."  Yes. You. Do.  Our 300MHz spec is routing a single column to a single row in a single module.  Once you start connecting multiple rows and columns at the same time, your bandwidth is going to drop off like the great recession.  Unfortunately, I can't comment further since I don't know about your test system and I haven't gathered this particular empirical data. 
-John Sullivan
Analog Engineer