Request for ZOPT (Load-pull) data for STM32WLE5CCU6 at 475 MHz

[InkWn]

Hi ST Community,

I am designing a custom board with STM32WLE5CCU6 (UFQFPN48 package) for a LoRa application in the 470–510 MHz band.

I will use RFO_LP only, with +14 dBm output power and VDD_MCU = 3.3 V.

Could you please provide the ZOPT (optimal impedance) for the PA output matching network at 475 MHz for this configuration?

AN5457 Appendix A only covers 868/900/915/923 MHz, so I cannot find the data for 475 MHz. If there is any reference design or application note for this frequency, please point me to it.

Thank you very much.

[Imen.D]

Hello ​@InkWn and welcome to the Community,

We do not have the ZOPT at 475 MHz, but we can share the optimal impedance at 490 MHz:

490MHz : Zopt = 7.8 + j*27.2

I recommend you these RF guidelines which may help you on your project:

• DB4797 for reference designs and codification
• AN5407 Application note How to optimize the RF board layout for STM32WL5x/Ex MCUs
• MOOC - STM32WL hardware and RF guidelines - YouTube

Hope this helps!