https://devzone.nordicsemi.com/f/nordic-q-a/119939/nrf54l15-evmHello, I have developed a module using 54L15 and am currently measuring its RF performance. On Rohde &amp; Schwarz instruments, I have observed numerous test results regarding EVM, but I am unsure which parameter on the instrument corresponds to the EVM specifieden-USTelligent Community 13Fri, 21 Mar 2025 07:36:29 GMThttps://devzone.nordicsemi.com/thread/528322?ContentTypeID=1Fri, 21 Mar 2025 07:36:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bccadf6e-a0c6-4b49-be20-0b8fae33b037Simonr<p>Hi</p> <p>IEEE 802.15.4, which uses O-QPSK modulation scheme at 250kpbs. Support for a given modulation scheme is added in the PHY later, but which modulation scheme to use is optional.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/528137?ContentTypeID=1Thu, 20 Mar 2025 07:20:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8be4b81-5e20-46d7-929d-286b2fa6a934zz19930722<p><span>Thank you for your response. In practical terms, is it correct that the standard for this modulation scheme is 35%rms?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/528133?ContentTypeID=1Thu, 20 Mar 2025 06:55:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02f250c9-fe9c-4811-a8df-58df0a63b0e3Simonr<p>Hi</p> <p>The 2%rms EVM in the datasheet is not a maximum limit, but rather the typical expected EVM value across all nRF54L15 SoCs. So 2.154%rms should be well within what&#39;s expected here.</p> <p>It is the offset value and not the absolute that should be used since you&#39;re measuring the OQPSK (<span><strong>Offset</strong> Quadrature Phase Shift Keying) modulation here. You can find some more information on OQSPK modulation here:&nbsp;<a href="https://www.everythingrf.com/community/what-is-oqpsk-modulation">https://www.everythingrf.com/community/what-is-oqpsk-modulation</a>&nbsp;</span></p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>