Hello SZhen.3,concerning the loop filter. If the TX spectrum looks clean and regulatory requirements can be met and locking time of the PLL is fast enough across the frequency range, then you might keep your loop filter design. Unless you encountered...
Hello Ssubr.1,to add more antenna ports you might consider changing the antenna switch from an SP2T type to an SPnT - n being the number of antenna ports needed.The FW of ST3993 is able to handle 200 to 500 and more tags by itself as it adjusts the Q...
Hello PRena.1the external PA is used by default.So you do not need to change the reader configuration for that.In any case the external PA can be selected in the Tx Options section under PA Selection.Cheers,B
Hello SZhen.3,I have reviewed the attached schematic and here's what I have found:1.)The loop filter circuit (C19, R2, C20) which is connected to the pin LF_CEXT shows different values.This is a significant change and affects the RF carrier (this par...
Hello Robert,by setting the msel bits you should be able to measure the Mixer DC level for I and Q. Please refer to STUHFL to see how we do the reflected power measurement in SW.Let me know if this information was helpful.Cheers,B
