Solution to avoid antenna desense

AN4356

10/14

DocID025260 Rev 1

Let us see the benefit of these solutions on the USB example shown at the beginning of this

note. Figure 14 and Figure 15 summarizes the results obtained in P-GSM 900 band and

WCDMA band VIII.

Figure 14. Effect of filtering during USB activity on TIS results in P-GSM 900 band

Figure 15. Effect of filtering during USB activity on TIS results in WCDMA (band VIII)

The ECMF improves the TIS in each band up to -7 dBm. If the minimum sensitivity required

is -103 dBm, 70% of the bands are recovered.

-80

-90

-100

-110

-120

No USB traffic

USB traffic without ECMF

P-GSM 900

935.2 MHz

947.4 MHz

959.8 MHz

USB traffic with ECMF

-80

-90

-100

-110

-120

927.4 MHz

942.4 MHz

957.6 MHz

No USB traffic

WCDMA Band VIII

USB traffic without ECMF

USB traffic with ECMF

Disqualified

Qualified