Has anyone tried twisting very thin wires(of order 100 microns) and then sandwiching it in between 2 layers of a multilayer PCB?
I have a problem of EMI and looks like twisted pair is the only solution as all means of shielding is ineffective due to DC magnetic field near field constrains.
Can experts in PCB comment on this ?
The real problem : Moving pickup coils on top of strong DC magnetic field. These induce heavy noises in a highly complex geometry problem. Of course a normal twisted pair cable would be a temporary solution but it is not robust. Also the use of Via's as twisted pair PCB was ruled out as the movement produces enough jerk to put high stresses on the via's.
Best Answer
While the whole idea sounds dodgy, I don't see why you need discrete wires to make a twisted pair. Criss-crossing diagonal traces on two adjacent layers, connected at short intervals by plated-through holes will do the same thing. Think of it as a series of X's (when viewed from above), with each segment terminated by a via.