The main parameters

AN4511

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DocID026455 Rev 1

Two other parameters, defining the differential return losses of the filter are below indicated:

•

These four characteristics, called mixed-mode S parameters, are calculated by S parameter

results of four-port measurements (see Figure 9).

Figure 9. CMF four-port measurements

Equations are below indicated:

•

•

•

•

Figure 10 shows the typical common mode rejection versus ECMF04-4HSM10 frequency.

In this curve, t the maximum rejection level of -32 dB is achieved at 900 MHz which is a

critical area in mobile applications.

Figure 10. Typical common mode rejection vs. frequency (ECMF04-4HSM10)

the device with USB3.0 filtering. The rejection range is wider, and a specific rejection point

at 5 GHz of -20 dB is implemented to eliminate this unwanted harmonic, which can disturb

some systems.