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SKY77517-21

Part Number	SKY77517-21
Manufacturer	Skyworks Solutions
Description	TX-RX iPAC FEM
Published	Dec 30, 2008
Detailed Description	DATA SHEET SKY77517–21 TX-RX iPAC™ FEM for Dual-Band GSM/GPRS Applications • Dual-band cellular handsets encompassing -...
Datasheet	SKY77517-21 PDF File

Overview

DATA SHEET SKY77517–21 TX-RX iPAC™ FEM for Dual-Band GSM/GPRS Applications • Dual-band cellular handsets encompassing - Class 4 GSM850 - PCS1900 - Class 12 GPRS multi-slot operation www.
DataSheet4U.
com Description The SKY77517–21 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for dual-band cellular handsets comprising GSM850 and PCS1900 operation.
Designed in a low profile, compact form factor, the SKY77517–21 offers a complete Transmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution.
The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.
The module consists of a GSM850 PA block and a PCS1900 PA block, impedance-matching circuitry for 50 Ω input and output impedances, TX harmonics filtering, high linearity and low insertion loss PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense resistor.
A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF switches.
The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAs) die.
One PA block supports the GSM850 band and the other PA block supports the PCS1900 band.
Both PA blocks share common power supply pads to distribute current.
The output of each PA block and the outputs to the two receive pads are connected to the antenna pad through PHEMT RF switches and a diplexer.
The GaAs die, PHEMT die, Silicon (Si) die and passive components are mounted on a multi-layer laminate substrate.
The assembly is encapsulated with plastic overmold.
Band selection and control of transmit and receive modes are performed using two external control pads.
Refer to the functional block diagram in Figure 1 below.
The band select pad (BS) selects between GSM and PCS modes of operation.
The transmit enable (TX_EN) pad controls receive or transmit mode of the respective RF switch (TX = logic 1).
Proper timi...

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SKY77517-21 TX-RX iPAC FEM - Skyworks Solutions

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