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3.3 FEM with integrated Power Amplifier Module (SKY77547, U400)
3.3 FEM with integrated Power Amplifier Module (SKY77547, U400)
3.3.1 Internal Block Diagram
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
(iPAC™) for quad-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900 operation.
3.3.2 General Description
Designed in a low profile, compact form factor, the SKY77547 offers a complete Transmit VCO-to-Antenna
The SKY77547 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control
and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service
(iPAC™) for quad-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900 operation.
(GPRS) multi-slot operation.
Designed in a low profile, compact form factor, the SKY77547 offers a complete Transmit VCO-to-Antenna
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance matching
and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service
circuitry for 50
input and output impedances, Tx harmonics filtering, high linearity and a low insertion loss
(GPRS) multi-slot operation.
PHEMT RF switch, and a Power Amplifier Control (PAC) block with internal current sense resistor. A custom
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance matching
BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF
circuitry for 50
input and output impedances, Tx harmonics filtering, high linearity and a low insertion loss
switches. The two Hetero junction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium
PHEMT RF switch, and a Power Amplifier Control (PAC) block with internal current sense resistor. A custom
Arsenide (Ga-As) die. One PA block supports the GSM850/900 bands and the other PA block supports the
BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF
DCS1800/PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The
switches. The two Hetero junction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium
output of each PA block and the outputs to the four receive pads are connected to the antenna pad through
Arsenide (Ga-As) die. One PA block supports the GSM850/900 bands and the other PA block supports the
a PHEMT RF switch. The Ga-As die, PHEMT die, Silicon (Si) die and passive components are mounted on a
DCS1800/PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The
multi-layer laminate substrate. The assembly encapsulated with plastic overmold.
output of each PA block and the outputs to the four receive pads are connected to the antenna pad through
a PHEMT RF switch. The Ga-As die, PHEMT die, Silicon (Si) die and passive components are mounted on a
multi-layer laminate substrate. The assembly encapsulated with plastic overmold.
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure. 3-3-1 SKY77547 FUNCTIONAL BLOCK DIAGRAM
Figure. 3-3-1 SKY77547 FUNCTIONAL BLOCK DIAGRAM
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
LGE Internal Use Only
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