I have a device which has two sections of the PCB completely isolated form each other, but connected by an isolator IC (PN: ????).
I think I need to shield the whole device for reducing EMI because I am having a lot of EMI from the device.
The isolator IC transfers data and clock between the two isolated sections of the board.
One section connects to USB and is powered by the USB host.
The other section is powered by an external power supply and also has connectors for some external input signals that are processed by an FPGA.
What should I do to reduce EMI?
If I use ferrite beads, where should I add the ferrite beads? At the isolators? On pins transferring clock signal, data signal or both? Or on Vcc?