Rejection capability

AN4541

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DocID026513 Rev 1

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Rejection capability

The data and clock frequency used in this link can cause high frequency noise and

corresponding harmonics to radiate and disturb other subsystems, especially in the RX part

of the phone. This can induce antenna desense which can cause calls to drop or high BER.

EMIF06-MSD04F3 introduces attenuation in the RX frequency range higher than -12 dB,

limiting these risks. A rejection simulation schematic for a typical layout is shown in

Figure 24 and the filter frequency response is given in Figure 25.

Figure 24. Rejection simulation schematic

Figure 25. Filter attenuation versus frequency

Crosstalk between two adjacent lines may also be an issue. This parameter is also

specified, and Figure 26 demonstrates that the noise generated, for example, by the clock

on a data line is negligible.