What is the real Impedance of ESP8266 LNA?

[YimingLi]

Hi,

In the datasheet 0a-esp8266-datasheet document, it says "LNA, RF Antenna Interface. Chip Output Impedance=50Ω No matching required. It is suggested to retain the π-type matching network to match the antenna."

However, in the ducument "esp8266-hardware matching guide", it says "The impedance of ESP8266 PA output end is 39+j6 Ω, so the matched impedance is 39-j6Ω (from antenna to the chip)."

Which one is correct ? or any explanations ?

Thanks,

YimingLi

[ESP_Faye]

Hi,

Sorry for the inconvenience, we will revise it.

This is correct.

in the ducument "esp8266-hardware matching guide", it says "The impedance of ESP8266 PA output end is 39+j6 Ω, so the matched impedance is 39-j6Ω (from antenna to the chip)."

Thanks for your interest in ESP8266!