Only For Training And Service Purposes - LG GT500 Service Manual

3. TECHNICAL DESCRIPTION
3.7.5. 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 three-
wire 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 3-7-11.
LGE Internal Use Only
Figure 3-7-13. RF Control Flow
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Only for training and service purposes