Rf Part Introductions - LG MG120a Service Manual

3. TECHNICAL BRIEF

3.2 RF Part Introductions

The RF part consists of a power amplifier part, a transmitter
part, a crystal reference system, and an ant-switch part.
3.2.1 Power Amplifier (RF3166, U102)
The RF3166 is a high-power, high-efficiency power amplifier module with integrated power
control that provides over 50dB of control range. The device is a self-contained 6mmx6mm
module with 50Ω input and output terminals. The device is designed for use as the final RF
amplifier inGSM850, EGSM900, DCS and PCS handheld digital cellular equipment and
other applications in the 824MHz to849MHz, 880MHz to 915MHz, 1710MHz to 1785MHz
and 1850MHz to 1910MHz bands. The RF3166 incorporates RFMD's latest VBATT tracking
circuit, which monitors battery voltage and prevents the power control loop from reaching
saturation. The VBATT tracking circuit eliminates the need to monitor battery voltage,
thereby minimizing switching transients. The RF3166 requires no external routing or
external components, simplifying layout and reducing board space.
Figure 3-2 Functional Block Diagram
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