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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9267EBZ датащи(PDF) 22 Page - Analog Devices |
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AD9267EBZ датащи(HTML) 22 Page - Analog Devices |
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22 / 24 page  AD9267 Rev. 0 | Page 22 of 24 Referring to Figure 46, the 3 dB cutoff frequency of the low- pass Chebyshev II filter response resides at 15.75 MHz, and at 10 MHz, there is 0.43 dB of attenuation due to the sharp roll-off of the filter. Table 15 summarizes the components and manufacturers used to build the circuit. Table 15. Chebyshev II Filter Components Parameter Value Unit Manufacturer C1 39 pF Murata GRM188 series, 0603 L1 180 nH Coil Craft 0402AF, 2% C2 390 pF Murata GRM188 series, 0603 C3 220 pF Murata GRM188 series, 0603 –20 0 2 4 6 8 1012 14161820 –18 –16 –14 –12 –10 –8 –6 –4 –2 0 –60 –50 –40 –30 –20 –10 0 10 20 30 40 FREQUENCY (MHz) Figure 46. Low-Pass Chebyshev II Filter Response In addition to matching the profile of Figure 44, group delay and channel matching are important filter design criteria. Low tolerance components are highly recommended for improved channel matching, which translates to minimal degradation in image rejection for quadrature systems. |
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