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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2744 датащи(PDF) 24 Page - STMicroelectronics |
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AN2744 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 56 page  Board description AN2744 24/56 5.1.3 Dual channel Rx passive filter The dual channel Rx passive filter is made of a resistor in series with a parallel L-C resonant circuit. The transfer function of the filter can be written as: Equation 2 where RL is the dc series resistance of the inductor L7 (in the worst case, 2 Ω) and CP is the equivalent capacitance for the two channels: C16 + C20 for 72 kHz, only C20 for 86 kHz. The center frequency and the quality factor of the filter can be expressed as: Equation 3 The simplification done in Equation 3 is possible because R18 >> RL. It's evident that the quality factor, and then the filter selectivity, depends not only on the value of R18, but also on RL. A higher RL means a lower steepness of the resonance, while a higher R18 gives a Figure 13. Simulated frequency response of the Tx passive filter for 86 kHz channel with tolerance effect 1E5 1E4 1E6 -35 -30 -25 -20 -15 -10 -5 0 5 -40 10 P 7 18 L 18 P 7 18 7 P L 18 2 P 7 18 L 7 C L R R R s C L R L C R R s C L R R L s ) s ( R ⋅ ⋅ + + ⋅ ⋅ ⋅ + ⋅ ⋅ + ⋅ ⋅ + ⋅ = P 7 P 7 18 L 18 C C L 2 1 C L R R R 2 1 2 1 fc ⋅ π ≅ ⋅ ⋅ + π = ω ⋅ π = |
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