Hello All,foot note 3 in table 47 of ST25R95 datasheet states that the maximum peak-to-peak voltage for (Vrx1-Vrx2) differential voltage is 18V, that is 9V peak. All signal exceeding 9V may be clamped by RX1 and RX2 input circuit protection.The 7V re...
Hi,first step is to validate the antenna tuning circuit (some frequency drift can exist between the calculation sheet and actual input impedance because of non predictable parasitic capacitance). the procedure is to measure the antenna impedance, cal...
Hello,RF switches are designed to operate with 50ohm loads. Even if they are equivalent to low impedance pass transistor, there can be some frequencies where non pure real load impedance can be transformed into different impedances because of resonan...
Hello,the ST25R95 antenna matching circuit shall be calculated based on the antenna impedance measured on the input of antenna cable. A good impedance matching in free air is necessary to maximize the tg detection mechanism. 5R/3uH impedance is measu...
Hi,sorry first for our very late answer.the antenna matching circuit shall be close to the ST25R95. Else, the twisted pair transmission line impact won't be compensated by the matching circuit and an impedance mismatch may occur at ST25R95 output. D...