https://devzone.nordicsemi.com/f/nordic-q-a/50865/nrf9160-with-vdd-and-vdd_gpio-at-3-3vSo its seems nrf9160 docs recommend having VDD_GPIO only at 1.8v ... that running at 3.0v (or 3.3v) will compromise LTE performace. I have 3.3v rail and 3.3v SPI device running at 10 MHz ... so was hoping to just have nrf9160 VDD and VDD_GPIO tied toen-USTelligent Community 13Tue, 13 Aug 2019 13:15:37 GMThttps://devzone.nordicsemi.com/thread/203835?ContentTypeID=1Tue, 13 Aug 2019 13:15:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b93636c-eafd-4e8b-848f-c671cf7e1f5eketiljo<p>It&#39;s recommended to use a GPIO voltage of 1.8 V only if you need to use high speed GPIOs near the radio, i.e on the right hand side of the module.&nbsp;</p><div style="clear:both;"></div>