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3. TECHNICAL BRIEF
3.3 FEM with integrated Power Amplifier Module (SKY77547, U303)
3.3.1 Internal Block Diagram
3.3.2 General Description
The SKY77547 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control
The SKY77547 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier
(iPAC™) for quad-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900 operation.
Control (iPAC™) for quad-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900
Designed in a low profile, compact form factor, the SKY77547 offers a complete Transmit VCO-to-Antenna
operation. Designed in a low profile, compact form factor, the SKY77547 offers a complete
and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service
Transmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports
(GPRS) multi-slot operation.
Class 12 General Packet Radio Service (GPRS) multi-slot operation.
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance matching
circuitry for 50 Ω input and output impedances, Tx harmonics filtering, high linearity and a low insertion
loss PHEMT RF switch, and a Power Amplifier Control (PAC) block with internal current sense resistor. A
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance
custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control
matching circuitry for 50
the RF switches. The two Hetero junction Bipolar Transistor (HBT) PA blocks are fabricated onto a single
and a low insertion loss PHEMT RF switch, and a Power Amplifier Control (PAC) block with
Gallium Arsenide (GaAs) die. One PA block supports the GSM850/900 bands and the other PA block
internal current sense resistor. A custom BiCMOS integrated circuit provides the internal PAC
supports the DCS1800/PCS1900 bands.
function and decoder circuitry to control the RF switches. The two Hetero junction Bipolar
Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block
supports the GSM850/900 bands and the other PA block supports the DCS1800/PCS1900 bands.
LGE Internal Use Only
Figure. 3.3.1 SKY77547 FUNCTIONAL BLOCK DIAGRAM
input and output impedances, Tx harmonics filtering, high linearity
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3. TECHNICAL BRIEF
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