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AN2451 Datasheet(PDF) 22 Page - STMicroelectronics |
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AN2451 Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 55 page  Board description AN2451 22/55 Doc ID 12791 Rev 3 Figure 12. Measured frequency response of the Tx active + passive filters connected to the CISPR network (typical curve) Figure 13. Simulated frequency response of the Tx active + passive filters connected to the CISPR network with the components tolerance effect 5.1.3 Rx passive filter The Rx filter is made up of a resistor in series with a parallel L-C resonant. The transfer function of the filter can be written as: Equation 4 where RL is the DC series resistance of the inductor (in our case, about 2 Ω). The center frequency and the quality factor of the filter can be expressed as: +/‐ 1 dB Rs () sL 6 R L + • R 17L6C26 ---------------------------- s 2 R 17RLC26 L 6 + R 17L6C26 --------------------------------------- s R 17 R L + R 17L6C26 -------------------------- + • + ---------------------------------------------------------------------------------------------- = |
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