What impedance is the LNA_IN pin on the ESP32-S3? Unlike the ESP32-S2 hardware design guide, the ESP32-S3 hardware design guide (https://www.espressif.com/sites/default ... nes_en.pdf) doesn't actually say. The -S3 design guide only says:
To design the matching network we would need to know the output pin impedance. We do not have a VNA so measuring the value directly is not possible.A π-type matching network is essential for antenna matching in the circuit design. CLC structure is recommended for the matching network. It is also recommended to add an LC filter circuit after the π-type matching network side to suppress secondary harmonics. The parameters of the components in the matching network are subject to the actual antenna and PCB layout. Figure 9 shows the RF matching schematic.
Thanks,
Sam