3. TECHNICAL BRIEF
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3.5.6 Dual band GSM power amplifier (U101)
The SKY77328 is a high-power, high-efficiency power amplifier module with integrated power control
that provides over 50dBof control range. The devices is a self-contained 6mm x 6mm module with 50Ω
input and output terminals. The device is designed for use as the final RF amplifier in GSM850,
EGSM900, DCS and PCS hand-held digital celluar equipment and other applications in the 824MHz to
849MHz, 880MHz to 915MHz, 1710MHz to 1785MHz and 1850MHz to 1910MHz bands. The VBATT
pin connects to an internal current-sense resistor and interfaces to an integrated power amplifier
control function, which is insensitive to variations in temperature, power supply, process, and input
power. The ENABLE input allows initial turn-on of PAM circuitry to minimize battery drain.
Figure 3.5.6-1 GSM PA functional block diagram
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