What is the real Impedance of ESP8266 LNA?

YimingLi
Posts: 50
Joined: Sun May 03, 2015 5:36 pm

What is the real Impedance of ESP8266 LNA?

Postby YimingLi » Sat Apr 08, 2017 10:52 pm

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
Posts: 1615
Joined: Mon Oct 27, 2014 11:08 am

Re: What is the real Impedance of ESP8266 LNA?

Postby ESP_Faye » Mon Apr 10, 2017 4:29 pm

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!

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