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SKY77324

Skyworks Solutions
Part Number SKY77324
Manufacturer Skyworks Solutions
Description iPAC PAM for Quad-Band GSM / GPRS
Published Dec 26, 2005
Detailed Description DATA SHEET SKY77324: iPAC™ PAM for Quad-Band GSM / GPRS Applications • Quad-band cellular handsets encompassing - Class...
Datasheet PDF File SKY77324 PDF File

SKY77324
SKY77324

Overview
DATA SHEET SKY77324: 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 The SKY77324 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 GSM850/900 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 CMOS 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 GSM850/900 bands and the other supports the DCS1800 and PCS1900 bands.
Both PA blocks share common power supply pins 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 SKY77324 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 SKY77324 also contains band-select 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 pin selects the PA output (DCS/PCS OUT or GSM850/900 OUT) and the Analog Power Control (VAPC) controls the level of output power.
VBATT and VSENSE pins connect to an internal current-sense resistor and interface to an integrated power amplifier control (iPAC™) function, which is insensitive to variations in temperature, power supply, and process.
Th...


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