TDA5250D2 Datasheet, PDF (50/97 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver

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TDA 5250 D2
preliminary
Applications
Above you can see the measurement of the evalboard with a span of 200MHz.
The evalboard has been optimized for 3V. The load is about 240+j0 at
868.3MHz.
A tuning-free realization requires a careful design of the components within the
matching network. A simple linear CAE-tool will help to see the influence of
tolerances of matching components.
Suppression of spurious harmonics may require some additional filtering within
the antenna matching circuit. Both can be seen in Figure 4-10 and Figure 4-11
The total spectrum of the evalboard can be summarized as:
Carrier fc
fc-18.1MHz
fc+18.1MHz
2^nd harmonic
3^rd harmonic
+9dBm
-62dBm
-66dBm
-40dBm
-44dBm
Figure 4-10 Transmit Spectrum 13.2GHz
oberwellentx.tif
Wireless Components
4 - 10
Specification, July 2002