https://devzone.nordicsemi.com/f/nordic-q-a/7516/nrf51822-dcdc-designNRF51822 supply voltage is 3V battery. When I design principle diagram, I have a question. Both AVDD and VCC_nRF are connect with the battery&#39;s positive?en-USTelligent Community 13Fri, 17 Jul 2015 07:12:06 GMThttps://devzone.nordicsemi.com/thread/26735?ContentTypeID=1Fri, 17 Jul 2015 07:12:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bfabd62c-d40a-4e19-b417-0432aaf525a0zcmm<p>thanks ,my device use DC-DC mode.i find the question. Useing DC-DC and LDO mode,Same board and tx power,LDO mode transmission distance is 90 meters,but DC-DC mode transmission distance is 45 meters.Can you tell me why?how solve it?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/26734?ContentTypeID=1Tue, 09 Jun 2015 09:40:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9d4b3d8b-bd1e-4a48-95f2-e061498f317b&#216;yvind Karlsen<p>Hi,</p> <p>When using DC/DC the AVDD pin should be connected to output of the DC/DC, i.e. AVDD to AVDD, and VCC_nRF to positive battery. This can be seen in the <a href="https://www.nordicsemi.com/eng/nordic/download_resource/20348/9/27098276">reference layout</a>.</p> <p>Best of luck, Øyvind</p><div style="clear:both;"></div>