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SKY77318

Skyworks Solutions
Part Number SKY77318
Manufacturer Skyworks Solutions
Description iPAC PAM for Quad-Band GSM/GPRS
Published Apr 19, 2010
Detailed Description www.DataSheet4U.com DATA SHEET SKY77318 iPAC™ PAM for Quad-Band GSM / GPRS Applications • Quad-Band cellular handsets ...
Datasheet PDF File SKY77318 PDF File

SKY77318
SKY77318

Overview
www.
DataSheet4U.
com DATA SHEET SKY77318 iPAC™ PAM for Quad-Band GSM / GPRS Applications • Quad-Band cellular handsets encompassing - Class 4 GSM850/900 - Class 1 DCS1800/ PCS1900 - Class 12 GPRS multi-slot operation Description The SKY77318 Power Amplifier Module (PAM) is designed in a low profile (1.
2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation.
The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.
The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching circuitry for 50 Ω input and output impedances and a Power Amplifier Control (PAC) block with an internal current-sense resistor.
The custom BiCMOS integrated circuit provides the internal PAC function and interface circuitry.
Fabricated onto a single Gallium Arsenide (GaAs) die, one Heterojunction Bipolar Transistor (HBT) PA block supports the GSM bands and the other supports the DCS1800 and PCS1900 bands.
Both PA blocks share common power supply pads to distribute current.
The GaAs die, the Silicon (Si) die, and the passive components are mounted on a multi-layer laminate substrate.
The assembly is encapsulated with plastic overmold.
RF input and output ports of the SKY77318 are internally matched to a 50 Ω load to reduce the number of external components for a quad-band design.
Extremely low leakage current (2.
5 μA, typical) of the dual PA module maximizes handset standby time.
The SKY77318 also contains bandselect switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the Band Select (BS) signal.
In Figure 1 below, the BS pad selects the PA output (DCS/PCS_OUT or GSM_OUT) and the Analog Power Control (VAPC) controls the level of output power.
The VBATT pad connects to an internal current-sense resistor and interfaces to an integrated power amplifier control (iPAC™) function, which is insensitive to variations in temperature, power supply, process, ...


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