https://devzone.nordicsemi.com/f/nordic-q-a/76491/nrf9160-ferrite-beads-on-vdd1-vdd2According to the recommendations a Ferrite Bead (FB1) shall be connected to VDD1 (together with de-coupling capacitors). Should VDD2 also have a Ferrite Bead connected? Noise to/from the nRF9160 via VDD2 is not filtered the same way as via VDD1.. Haveen-USTelligent Community 13Fri, 18 Jun 2021 07:17:49 GMThttps://devzone.nordicsemi.com/thread/316011?ContentTypeID=1Fri, 18 Jun 2021 07:17:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd299aad-3f31-4524-934c-a095885cab40JONATHAN LL<p>Hi,<br /><br /><br />VDD2 does not need a ferrite bead, following the recommendations form the <a href="https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/vdd1_vdd2.html?cp=2_0_7_0_3_3">Hardware integration guide</a> is sufficient.&nbsp;<br /><br /><br />Reason for the extra filtering on VDD1 is due to how it is connected in the SiP:<br /><em><span>VDD1</span>&nbsp;is connected to the DC converter input of the nRF9160-internal PMU that supplies the&nbsp;<a title="A microchip that integrates all the necessary electronic circuits and components of a computer or other electronic systems on a single integrated circuit." href="https://infocenter.nordicsemi.com/topic/nwp_037/dita_common/glossary/glossary.html#soc"><dfn>System on Chip (SoC)</dfn></a>.&nbsp;<span>VDD2</span>&nbsp;is connected to the DC converter input of the nRF9160-internal PMU that supplies the RF&nbsp;<a title="A device used to increase the transmit power level of a radio signal." href="https://infocenter.nordicsemi.com/topic/nwp_037/dita_common/glossary/glossary.html#pa"><dfn>Power Amplifier (PA)</dfn></a>.<br /><br /><br /></em>Hope this clears up any confusion.<br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>