Siemens SL55 - Frontendmodul (Electrical Antenna Switch)

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SL55
Company Confidential © Copyright Siemens AG
06/03
4.3 Frontendmodul (Electrical Antenna Switch)
EGSM900/GSM1800/GSM1900 <> Receiver/Transmitter
The frontend has two functions.
- to select the different GSM bands
- to switch between RX and TX mode
Inside the frontendmodul SAW filters are integrated in the RX paths.
Mode Selection FEM 1 / VC1 FEM 2 / VC2 FEM 3 / VC3
EGSM900 RX LOW LOW LOW
EGSM900 RX HIGH LOW LOW
GSM1800 RX LOW LOW LOW
GSM1800 TX LOW HIGH LOW
GSM1900 RX LOW LOW HIGH
GSM1900 TX LOW HIGH LOW
to
Demodulator
to Antenna
from
P
A
Control Signals
from Smarti