ADL5382ACPZ-R7 datasheet(20/28 Pages) AD

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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

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

–20

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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