Hello Thank you for your support always.
Our customer who is considering ADuM6402 has question about AN-0971.
There is a comment as below.
The rectifier circuit on the secondary side effectively doubles this frequency during the rectification process.
What is this meaning?
The customer has 360MHz EMI noise issue. They could clear 180MHz with shielding and something.
But it would be difficult to improve 360MHz EMI noise.
I recommend edge guard and so on.
Thank you for the comment. Now I have some customers who are designing isoPower.
It is helpful if you share the slides to me.
The full wave rectification on the secondary side doubles the primary side frequency of 180MHz to 360MHz. The app note AN-0971 recommends the use of stitching capacitance using the inner layers of the PCB to make a high frequency capacitor that will reduce the emissions at 360MHz.
Recent tests have also shown that the use of ferrites on the Viso and GNDiso pins will also help reduce emissions from the 180 & 360MHz, and requires less stitching capacitance.
If they are interested in the use of ferrites, I could send a PPT to your email address.
Power-man: I sent the slides to your email address. This is work in progress, eventually the AN-0971 will be updated with techniques using ferrites.
I haven't received the slide. Could you confirm?
Brian-san, Thank you very much. I got it.