https://community.nxp.com/t5/NFC/PN7160-matching-with-DPC/m-p/1602009#M10045 <P>Hello,</P><P>According to the antenna matching guide, asymmetric matching is used for the OM27160 demo board (fr0 = 22MHz).</P><P>According to the circuit diagram for the demo board, the filter frequency is 14.5MHz (160nH, 750pF), so symmetrical is used which, according to the antenna matching guide, requires DPC ?<BR /><BR />In the source code (I use the MCUXpresso library) nothing indicates that DPC is used.</P><P>Does the demo project use DPC and what filter value is recommended?</P><P>I designed and calculated my own board with a slightly larger antenna and achieve extremely poor results with a fr0 with 22MHz and only passable with 14.5MHz.</P><P>The antenna data was determined with a network analyzer, the matching circuit with the online tool and the PN7160 matching calculator.</P><P>Where can I start to get better results? (Increase Q, increase fr0, ...)</P><P>How can I restore the default values ​​of the NxpNci_RF_CONF? The default values ​​are not mentioned in the UM.</P><P>Thanks very much,<BR />Michael</P> Mon, 20 Feb 2023 12:58:39 GMT michael_d_1983 2023-02-20T12:58:39Z https://community.nxp.com/t5/NFC/PN7160-matching-with-DPC/m-p/1602009#M10045 <P>Hello,</P><P>According to the antenna matching guide, asymmetric matching is used for the OM27160 demo board (fr0 = 22MHz).</P><P>According to the circuit diagram for the demo board, the filter frequency is 14.5MHz (160nH, 750pF), so symmetrical is used which, according to the antenna matching guide, requires DPC ?<BR /><BR />In the source code (I use the MCUXpresso library) nothing indicates that DPC is used.</P><P>Does the demo project use DPC and what filter value is recommended?</P><P>I designed and calculated my own board with a slightly larger antenna and achieve extremely poor results with a fr0 with 22MHz and only passable with 14.5MHz.</P><P>The antenna data was determined with a network analyzer, the matching circuit with the online tool and the PN7160 matching calculator.</P><P>Where can I start to get better results? (Increase Q, increase fr0, ...)</P><P>How can I restore the default values ​​of the NxpNci_RF_CONF? The default values ​​are not mentioned in the UM.</P><P>Thanks very much,<BR />Michael</P> Mon, 20 Feb 2023 12:58:39 GMT https://community.nxp.com/t5/NFC/PN7160-matching-with-DPC/m-p/1602009#M10045 michael_d_1983 2023-02-20T12:58:39Z https://community.nxp.com/t5/NFC/PN7160-matching-with-DPC/m-p/1609916#M10075 <P>How can I restore the default values ​​of the NxpNci_RF_CONF? The default values ​​are not mentioned in the UM.</P><P>Thanks very much,<BR />Michael</P> Mon, 06 Mar 2023 09:43:12 GMT https://community.nxp.com/t5/NFC/PN7160-matching-with-DPC/m-p/1609916#M10075 michael_d_1983 2023-03-06T09:43:12Z