nRF9160 sch review for SPI Flash and RF frequency switching control

[koen.chen]

Dears

My customer is using nRF9160，Two SPI interfaces are being used，one for LCD，Another one for SPI Flash，LCD SPI has been debugged，SPI Flash is a newly added device，U8807 in SCH file。

Pls help check SPI Flash interfaces。

In addition, because antenna debugging requires adding antenna switches to distinguish the matching of low-frequency and high-frequency bands, which GPIO ports can be used as the control of antenna switches (different frequency bands choose different matching parameters)，At least 2 gpios are required。

2437.u8_9160_sch.pdf

[koen.chen]

Dear Kaja

"2. The filter FL82 should be on the input of the LNA, we recommend to us a LNA with a internal filter or add a external filter on the input of the LNA. "----We have got an early suggestion for Nordic Local FAE，He said：A filter after the LAN should be needed。

Please help confirm which one is correct again。

thanks！

[Kaja]

I guess he just misunderstand what it means, it should be on the input of the LNA, meaning closes to the antenna. 

So: GPS pin on nRF91 - LNA - Filter - Matching network for antenna - Antenna

I will be out off office the next couple of weeks. 

Best regards,
Kaja