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AN3394 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN3394 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 29 page  AN3394 Description of DEMO-CR95HF-A and criteria for impedance matching Doc ID 018754 Rev 5 9/29 1.5 Impedance matching circuit 1.5.1 Antenna circuit description The impedance matching circuit is composed of a serial capacitance circuit (C2and C6) and a parallel capacitance circuit (C3and C17). Successive impedance transformation allows to simplify the antenna equivalent circuit and to calculate C2, C6, C3 and C17 capacitances easily. Figure 6. Antenna circuit description Where R1,R5: 330 Ω. These resistors are used to limit the signal level on RX1-RX2. They must be considered in the calculation of the impedance matching circuit. Cinput: 22 pF. Cinput is the integrated capacitor between RX1-RX2. As R1,R5, it must be considered for the impedance matching circuit. |
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