Hello,I am new to NFC solutions and want to design a product that can read tags for 40cm distance with ST25R3911B , could you give me some suggestions ? And how to adjust the antenna driver output resistance (register 0x27) to match the impedan...
Hi，I am trying to design NFC antenna with ST25R3911B，the antenna size is about 30*30cm，and the read range need 35cm；I want to know the target matching impedance ，and is it possible to fulfill this requirement with the ST25R3911B NFC reader?
Hello Travis，Recently I use the ST25R3916 board(1.7W) and try to find the power or sensitivity limited issue. I use the pick-up coil connected to the oscilloscope to test , Results as below: Tag can be read area:(two different waveform)When I increa...
Hi Lebon，Thanks for your help.Yes，the tag antenna need a small antenna in my case，and need to receive four directional signals. Could you give me some suggestion about the shape of the tag antenna？Now i'm studying AN2972， one question is how to defi...
Hi Travis,Thanks for the reply.Do you mean maybe need add an additional amplifier between IC's RFO pins and antenna matching network?And another question is for tag (ST25DV64K),What values do you recommend for the inductance and impedance of the coi...
Hello Travis,I have disconnected the AAT in my previous tuning.And I tuned the matching impedance to 7Ω and connected pin9 to VDD（J303 with 0Ω），the distance no improve，could you tell me how to optimize the settings of internal receiver signals？And do...
