My customer query is about AN-1109 Page.8 Figure.10.
Does ADI have recommendation value for below item?
1.What is the VIA diameter?
("test boards used 4 mm via spacing for their evaluation boards." in the document)
2.How wide guard ring trace?
The customer is going to PCB re-design for mitigation emission.
They have evaluated ADuM1301 for auxiliary inverter.
Their EMI target CISPR25.