Transmitter (TX)
The digital baseband signal (eg. from the microphone) is converted to an analogue signal, which is then
amplified and transmitted from the antenna. The frequency of this signal can be tuned to match the
bandwidth of the system in use (eg. GSM900).
The transmitter functions are implemented in the RF system module and Frontend module including power
amplifier and antenna switch.
RM-352; RM-354
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 –17
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