WiFi Power

chirag.sharma
Posts: 6
Joined: Mon Jan 02, 2017 8:37 am

WiFi Power

Postby chirag.sharma » Mon Jan 02, 2017 11:06 am

Hi,

We have used ESP32 chip on one of our board and we are doing measurement related to WiFi Power.

We have tested WiFi Transmit Power by downloading FCC test binary "ESP32_FCC_WIFI_BT_20161208_V1.0.4.bin" on our hardware.

There is one filter circuitry at LNA_IN (Pin number 2 of ESP32) and we put one U.FL connector after this filter circuitry to measure power.

We got 15.68dBm transmit (TX) power at U.FL connector instead of 20dBm in single carrier mode (SCW).

Request you to provide feedback that why we get 15.68dBm instead of 20dBm? Also proivde us your test results for ESP32.

Note: We have taken spectrum analyzer for WiFi Power measurement

chirag.sharma
Posts: 6
Joined: Mon Jan 02, 2017 8:37 am

Re: WiFi Power

Postby chirag.sharma » Tue Jan 03, 2017 5:11 am

Can anyone provide input on my query?

WiFive
Posts: 724
Joined: Tue Dec 01, 2015 7:35 am

Re: WiFi Power

Postby WiFive » Tue Jan 03, 2017 10:17 am

See pg 51. Similar result?

https://fccid.io/document.php?id=3212968

Datasheet says:
Output power of PA for 72.2 Mbps 15.5 16.5 17.5 dBm
Output power of PA for 11b mode 19.5 20.5 21.5 dBm

chirag.sharma
Posts: 6
Joined: Mon Jan 02, 2017 8:37 am

Re: WiFi Power

Postby chirag.sharma » Tue Jan 03, 2017 12:43 pm

Hello,
Thanks for it.
I have referred report and found that peak power is around 21dBm and average power is around 17dBm.

Actually we are using ESP32 chip and we did testing in single carrier mode.
For single carrier mode,we got peak power 15.68dBm.

ESP_Jack
Posts: 7
Joined: Wed Jan 04, 2017 9:30 am

Re: WiFi Power

Postby ESP_Jack » Wed Jan 04, 2017 10:20 am

I have 5 questions:
1.Which command did you use?
2.Which channel did you use?
3.Which rate did you use, 1Mbps?
4.Have you considered about the corrected factor?
5.Did you design the board yourself?

If you design the board yourself, I'd like you to use official module or EVB.

ESP_Jack
Posts: 7
Joined: Wed Jan 04, 2017 9:30 am

Re: WiFi Power

Postby ESP_Jack » Wed Jan 04, 2017 10:31 am

I have 5 questions:
1.Which command did you use?
2.Which channel did you use?
3.Which rate did you use, 1Mbps?
4.Have you considered about the corrected factor?
5.Did you design the board yourself?

If you design the board yourself, I'd like you to use official module or EVB.

ESP_Jack
Posts: 7
Joined: Wed Jan 04, 2017 9:30 am

Re: WiFi Power

Postby ESP_Jack » Wed Jan 04, 2017 10:32 am

I have 5 questions:
1.Which command did you use?
2.Which channel did you use?
3.Which rate did you use, 1Mbps?
4.Have you considered about the corrected factor?
5.Did you design the board yourself?

If you design the board yourself, I'd like you to use official module or EVB.

chirag.sharma
Posts: 6
Joined: Mon Jan 02, 2017 8:37 am

Re: WiFi Power

Postby chirag.sharma » Wed Jan 04, 2017 11:27 am

Please find my answers below:

1.Which command did you use?
Chirag: wifiscwout 1 1 0

2.Which channel did you use?
Chirag: Channel number 1.

3.Which rate did you use, 1Mbps?
Chirag: We have tested single carrier mode but for further testing we have also tested power with command "wifitxout 1 0x0 0" and for that we didn't get power near to 15-16dBm, not more than that.

4.Have you considered about the corrected factor?
Chirag: As we operate in single carrier mode, I think we don't require corrected factor.

5.Did you design the board yourself?
Chirag: Yes we designed board ourself.

Regarding module, we have module and EVK of ESP32 but all of them don't have U.FL connector to measure power and we don't prefer to rework EVKs and module to solder U.FL connector.

Current Status at our side: We are trying to calculate loss due to filter circuitry which is no RF line (LNA_IN pin of ESP32).

ESP_Jack
Posts: 7
Joined: Wed Jan 04, 2017 9:30 am

Re: WiFi Power

Postby ESP_Jack » Thu Jan 05, 2017 1:45 am

One more question:
What's the power you want?

I have 2 suggestions:
1.Give a picture of your test bench.
2.If we can't find the cause any way, please send a board to us.

chirag.sharma
Posts: 6
Joined: Mon Jan 02, 2017 8:37 am

Re: WiFi Power

Postby chirag.sharma » Thu Feb 02, 2017 4:41 am

We got success to get proper TX Output Power by adding 2.2nH inductor in series.

But the point is, we used recommended Pi network (same as provided in reference design) though we need to add 2.2nH inductor in series to get power.

Can anyone provide any input?

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