Transmitter Part - LG T5100 Service Manual

2. TECHNICAL BRIEF
Fig 2. Block Diagram of Synthesizer Part

2.4 Transmitter Part

The Transmitter part contains OPLL parts of RF Main Chipset [TRF6151, U702], Power Amplifier
Module [SKY77325, U709] and Front-End Module [SHS-L090SF, FL700]. The transmit section of RF
Main Chipset [TRF6151, U702] consists of an I/Q base-band up-converter, an offset phase-locked
loop [OPLL]. The RF GMSK outputs from the transmit VCO are fed directly to the RF power amplifier
modules.
The peak output power and the profile of the transmitted burst are controlled by means of incorporated
power control circuits inside of PA and DAC output from the Baseband Controller. The PA outputs
pass to the antenna connector via Front-End Module [SHS-L090SF, FL700].
Dual
GSM900
Dual
LNA 900
Figure 3. FEM Block Diagram
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