Hi,
I am designing a board with ESP32-S3 SoC. While reviewing the ESP32-S3 Hardware Design Guidelines document, I noticed that in the RF section, the reference schematic shows additional LC components after the Pi network.
I have not seen an inductor and capacitor in series with each other connected between the RF and Ground pin in any similar RF designs. For example, I have designed a board using ESP32-S2, but the ESP32-S2 Hardware Design Guidelines only contain a Pi network on the RF pin.
I am looking for reasons to use an LC structure on the RF pin. Is it to suppress harmonics and to pass FCC/CE radiation tests?
If the board needs to be FCC certified, will including the LC structure help it pass radiation tests, or can it be safely omitted?
Thanks.
Additional LC on RF pin in ESP32-S3 reference schematic
Additional LC on RF pin in ESP32-S3 reference schematic
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