nRF9160 SIBA on custom board is unable to connect to NB-IOT and resets after about 10 seconds of operation.
Without a call to lte_lc_init_and_connect the reset does not happen.
The power, as suggested in other topics is at 2.6V from dc power supply with limit set to 1A.
Side note: this setting is the only one allowing for the programmer to reach the SiP. At planned 3.3V the programmer is not able to connect to the chip. For now just a missing power IC -> power supply is used.
This is the current PCB. No parts below, so not showing the other side. It is 4 layered with internal layers be ground and power polygons.
Current matching circuit has 15nH coil parallel to 0.3pF and 0.1pF capacitors next to antenna, then 2.4nF capacitor in series to wire, then via microstrip to nRF9160. I already did a test with 3Ghz specturm analyser connected via 50 Ohm coaxial cable soldered close to nRF (you can see bare metal there). This setup is picking 845MHz signal from Thingy:91 at a nice -10dB level surrounded by -50dB ambient noise. Can do more tests if needed.
This is the schematics of powering. Vdd = 3.3V Just in case
Now struggling to make segger RTT show up in terminal.
This is the current PCB. No parts below, so not showing the other side. It is 4 layered with internal layers be ground and power polygons.
Current matching circuit has 15nH coil parallel to 0.3pF and 0.1pF capacitors next to antenna, then 2.4nF capacitor in series to wire, then via microstrip to nRF9160. I already did a test with 3Ghz specturm analyser connected via 50 Ohm coaxial cable soldered close to nRF (you can see bare metal there). This setup is picking 845MHz signal from Thingy:91 at a nice -10dB level surrounded by -50dB ambient noise. Can do more tests if needed.
This is the schematics of powering. Vdd = 3.3V Just in case
Now struggling to make segger RTT show up in terminal.
