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ADL5380 Datasheet(PDF) 29 Page - Analog Devices |
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ADL5380 Datasheet(HTML) 29 Page - Analog Devices |
29 / 36 page ADL5380 Rev. 0 | Page 29 of 36 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. Figure 92 shows a fourth-order filter designed for a 10 MHz wide LTE signal. As shown in Figure 92, the resultant inductor and capacitor values become much more practical with a 200 Ω load. 2.2µH 2.2µH 1.5µH 1.5µH Figure 92. Fourth-Order Low-Pass LTE Filter Schematic Figure 93 and Figure 94 illustrate the magnitude response and group delay response of the fourth-order filter, respectively. –35 –25 –15 –5 –30 –20 –10 0 –40 5 FREQUENCY (MHz) 40 35 30 25 20 15 10 5 0 Figure 93. Fourth-Order Low-Pass LTE Filter Magnitude Response 5 10 1520253035 40 0 10 20 30 40 50 0 60 FREQUENCY (MHz) Figure 94. Fourth-Order Low-Pass LTE Filter Group Delay Response |
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