https://community.nxp.com/t5/NFC/MFRC631-Power-Setting/m-p/1724990#M10754 <P>Hi All,</P><P>Using <SPAN class="">MFRC63102HN,151</SPAN> and attempting to reduce the power output on the transmitter. I am currently configured with "set_cw_amplitude" to 0: TVDD-100mV, the highest power setting. This is located in register 0x29h TxAmp. With new settings I put "set_cw_amplitude" to 3: TVDD-1000mV and additionally cleared Cwmax to 0. Cwmax is located in register 0x2Ah TxCon</P><P>When I did comparisons between the two with a spectrum analyzer there was no difference in output power. I don't have a great idea of how much of a delta there should have been, but I was expecting there to be some difference. Can anyone advise if I am missing something?</P> Mon, 18 Sep 2023 22:04:05 GMT nmamore 2023-09-18T22:04:05Z https://community.nxp.com/t5/NFC/MFRC631-Power-Setting/m-p/1724990#M10754 <P>Hi All,</P><P>Using <SPAN class="">MFRC63102HN,151</SPAN> and attempting to reduce the power output on the transmitter. I am currently configured with "set_cw_amplitude" to 0: TVDD-100mV, the highest power setting. This is located in register 0x29h TxAmp. With new settings I put "set_cw_amplitude" to 3: TVDD-1000mV and additionally cleared Cwmax to 0. Cwmax is located in register 0x2Ah TxCon</P><P>When I did comparisons between the two with a spectrum analyzer there was no difference in output power. I don't have a great idea of how much of a delta there should have been, but I was expecting there to be some difference. Can anyone advise if I am missing something?</P> Mon, 18 Sep 2023 22:04:05 GMT https://community.nxp.com/t5/NFC/MFRC631-Power-Setting/m-p/1724990#M10754 nmamore 2023-09-18T22:04:05Z https://community.nxp.com/t5/NFC/MFRC631-Power-Setting/m-p/1729067#M10781 <P>Hi&nbsp;&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/223150">@nmamore</a>,</P> <P>You are correct, a prominent difference should be present.</P> <P>Please help me with more information about the case, could you provide images of these measurements, and how are you measuring them? Is this with an oscilloscope?</P> <P>What configuration is left for set_residual_carrier?</P> <P>Also, please help me confirming your Transmitter Power Supply (TDD) is between 3.3 and 5.0 V, as this is the recommended range of voltage.</P> <P>Best regards,<BR />Julián</P> Mon, 25 Sep 2023 17:19:47 GMT https://community.nxp.com/t5/NFC/MFRC631-Power-Setting/m-p/1729067#M10781 Julián_AragónM 2023-09-25T17:19:47Z