Matching circuit and signal receiving circuit diagram

Published:2011/6/20 6:26:00 Author:Lucas | Keyword: Matching circuit , signal receiving | From:SeekIC

Internal receiver circuit works rely on the responding signals of card having modulation function on the bilateral area of sub-carrier. VMID signal produced by the internal circuit of MFRC522 is used as the bias of RX pin input signal. It needs to connect a capacitor C4 between VMID and GND for stabilizing VMID output. Receiver circuit needs to be connected a voltage divider circuit between the RX and VMID. The matching circuit and the signal receiving circuit is shown as the chart. The figure includes EMC low pass filter (L01, L02, C01, C02), receiver circuit (R66, C3, R65, C4), antenna matching circuit (C03, C04 , C2A, C2B, R2A, R2B) and antenna.



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