The engineers over at Semtech were kind enough to carry out a PCB design review of the module. The feedback was positive overall, but pointed out a few areas I could modify to improve performance.
The key points:
- Use a TCXO instead of regular crystal oscillator as my 32MHz reference. This improves GNSS performance for portable devices where temperature compensation may be more important.
- Improve RF isolation between RF Power Amplifier pin and Sub-GHz RF output pin
- Spread out RF switch and RF power traces to reduce crosstalk
- Remove a few unnecessary test points
I'm pretty happy with the feedback I got on the design, the next step is to get this built once I get my hands on the LR1110!