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ADL5382ACPZ-R7 датащи(PDF) 20 Page - Analog Devices |
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ADL5382ACPZ-R7 датащи(HTML) 20 Page - Analog Devices |
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20 / 28 page ![]() ADL5382 Rev. 0 | Page 20 of 28 As the load impedance of the filter increases, the filter design becomes more challenging in terms of meeting the required rejection and pass band specifications. In the previous W- CDMA example, the 500 Ω load impedance resulted in the design of a sixth-order filter that has relatively large inductor values and small capacitor values. If the load impedance is 200 Ω, the filter design becomes much more manageable. As shown in Figure 54, the resultant inductor and capacitor values become much more practical. 10µH 10µH 8µH 8µH Figure 54. Fourth-Order Low-Pass W-CDMA Filter Schematic Figure 55 and Figure 56 illustrate the magnitude response and group delay response of the fourth-order filter, respectively. –15 –10 –5 0 –20 5 FREQUENCY (MHz) 3.8 3.4 3.0 2.6 2.2 1.8 1.4 1.0 0.6 0.2 Figure 55. Fourth-Order Low-Pass W-CDMA Filter Magnitude Response 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0.2 200 300 400 500 600 700 800 100 900 FREQUENCY (MHz) Figure 56. Fourth-Order Low-Pass W-CDMA Filter Group Delay Response |
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