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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.
Control Signals
from Smarti
from
PA
Demodulator
Mode Selection
EGSM900 RX
EGSM900 RX
GSM1800 RX
GSM1800 TX
GSM1900 RX
GSM1900 TX
V 1.0
SL55
to
FEM 1 / VC1
FEM 2 / VC2
LOW
LOW
HIGH
LOW
LOW
LOW
LOW
HIGH
LOW
LOW
LOW
HIGH
Company Confidential © Copyright Siemens AG
Customer Care
to Antenna
FEM 3 / VC3
LOW
LOW
LOW
LOW
HIGH
LOW
Page 10of 52
ICM MP CCQ GRM
06/03
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