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ngodoanvan
ngodoanvan
Associate III
October 6, 2022
Question

the VR_PA voltage is smaller than 3.1V in HP configuration

  • October 6, 2022
  • 2 replies
  • 1122 views

Hi,

I designed the hardware like the firgure below,

0693W00000UnT9AQAV.pngmy schematic below,

0693W00000UnT9eQAF.pngthe VDD connected to the VDDPA pin.

VR_PA voltage is 1.7 - 1.9V.

when Lora transmit the VR_PA voltage is smaller than 3.1V.

Please support me. Thank you very much

This topic has been closed for replies.

2 replies

Louis AUDOLY
Louis AUDOLY
ST Employee
October 7, 2022

Hello @Ngô Vạn​ ,

Can you tell me if you well configure your software to be in high power (22dBm) ? And if you have well selected the HP output for your measurements ?

Have you measured your output power ?

Thank you for your answers

Best regards

Louis

ngodoanvan
ngodoanvanAuthor
Associate III
October 11, 2022

In schematic reference file the C17 capacitor's value is 68pF. I tried to replace C17 capacitor's value to 10uF. My application work correctly. What wrong in my design ?0693W00000UnoW5QAJ.pngPlease support me. Thanks

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