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How can I further lower electromagnetic emissions when using integrated isolated power devices?
Because high-frequency switching is used in integrated power and signal isolation devices, long cables in the system or larger PCB’s can behave as antennas and pick up this noise. To solve this, one can implement common-mode chokes to capture the unwanted noise and steer it to ground. Operating at a lower power supply (3.3V in and 3.3V out), using filters, and implementing a PCB interlayer switching capacitance can further reduce emissions. The amount of emissions measured also depends on PCB design and test setup. For detail on implementing common-mode chokes to reduce noise in your signal, please refer to Section 6 of this document Low-Emission Designs With ISOW7841 Integrated Signal and Power Isolator, and please read this blog.
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