Hi there,
in the Datasheet of ESP8685 the impedance of LNA_IN pin is not listed.
In ESP32-C3 Datasheet also no value is given.
Please advise on which value to use for ESP8685H4 chip.
Thank you!
ESP8685 LNA_IN Impedance
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- Joined: Mon Jan 04, 2021 2:06 pm
Re: ESP8685 LNA_IN Impedance
Hi,
Please take a look at the ESP32-C3 Hardware Design Guidelines page.
Please take a look at the ESP32-C3 Hardware Design Guidelines page.
The RF trace should have a 50 Ω characteristic impedance.
Re: ESP8685 LNA_IN Impedance
Hi,
thank you. The Trace to the Antenna should be 50Ω single ended impedance.
Matching circuit is intended for matching LNA_IN pins output impedance to the trace and later to the antenna.
However Hardware design guide and Datasheet do not mention the ouput impedance of LNA_IN pin, so this is what i am looking for.
In addition I think there is an error in https://docs.espressif.com/projects/esp ... tub-layout. As stated the stub from first C should be connected to L3 (which is power according to stackup) and I do think this should be L2 which is supposed to be GND.
Is the output impedance the same as ESP32-C3? I found here https://esp32.com/viewtopic.php?t=21649 that it should be: (30 ~ 40) ±10 jΩ
Or is the package already matched internally to 50Ω?
thank you. The Trace to the Antenna should be 50Ω single ended impedance.
Matching circuit is intended for matching LNA_IN pins output impedance to the trace and later to the antenna.
However Hardware design guide and Datasheet do not mention the ouput impedance of LNA_IN pin, so this is what i am looking for.
In addition I think there is an error in https://docs.espressif.com/projects/esp ... tub-layout. As stated the stub from first C should be connected to L3 (which is power according to stackup) and I do think this should be L2 which is supposed to be GND.
Is the output impedance the same as ESP32-C3? I found here https://esp32.com/viewtopic.php?t=21649 that it should be: (30 ~ 40) ±10 jΩ
Or is the package already matched internally to 50Ω?
-
- Posts: 364
- Joined: Mon Jan 04, 2021 2:06 pm
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