All,
My design includes a differential amplifier cascaded pair at 20 kHz to
5 MHz. The amplifer I am using is the AD8331. I have routed the signals differentially through, the differential pairs mostly reside on the top layer and layer 3 (between ground layers)From what I have heard online, it appears that trace lengths in differential routing is very important - however how much impact does it have under 5 MHz. It appears that my routes are are around 20/30 mils mismatch, though I am trying to reduce it.
Also, my signals route from the top layer (where the ICs are) to layer
3 through vias and mostly travel through layer 3. but occassionaly come up to the top layer to the ICs. I am not sure if this is good practice or if there can be problems associated. Now, is there a guideline for differential pairs to be on the top or internal layer? Is there a good book or a resource that can throw more light on this?Thanks
Ray