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3.4 Control Flow
The access side of the digital baseband controller controls the overall radio system. In both EDGE/GSM/GPRS and
W-CDMA air interface mode, the digital baseband controller controls the radio system through a serial bus .The digital
baseband controller also manages PA band control and the antenna switch mechanism in the front end module.
The EDGE/GSM/GPRS RF system requires control, which is temperature dependent.
The temperature within the RF system is estimated by a voltage measurement performed by the analog baseband con-
troller.
The control flow for the RF system is shown in Figure 3.4.1.
FEM
LGE Internal Use Only
Amplitude Control
WCDMA PAM
PA Control
Power Control
GSM/GPRS/EDGE
PAM
Band Select
Antenna Switch Control
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3. TECHNICAL BRIEF
QSC62X0
Baseband controller
+
Transceiver
+
Receiver
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PMIC
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Only for training and service purposes
GU295
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Troubleshooting
