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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
3.5. 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 26 MHz VCXO clock residing in the GSM/EDGE transceiver is turned on only when required, the digital
baseband controller initiates this.
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
controller. The control flow for the RF system is shown in Figure 1.5.1.
Figure 1.5.1 Block diagram of FEM