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SKY77321

Skyworks Solutions
Part Number SKY77321
Manufacturer Skyworks Solutions
Description PA Module
Published Jan 24, 2007
Detailed Description www.DataSheet4U.com ADVANCE PRODUCT SUMMARY SKY77321: PA Module for Tri-Band EGSM / GPRS Applications • Tri-band cellu...
Datasheet PDF File SKY77321 PDF File

SKY77321
SKY77321

Overview
www.
DataSheet4U.
com ADVANCE PRODUCT SUMMARY SKY77321: PA Module for Tri-Band EGSM / GPRS Applications • Tri-band cellular handsets encompassing - Class 4 EGSM900 - Class 1 DCS1800 PCS1900 - GPRS (up to Class 12) multislot operation The SKY77321 Power Amplifier Module (PAM) is designed in a compact form factor for tri-band cellular handsets comprising EGSM900, DCS1800, and PCS1900 operation.
It also supports Class 12 General Packet Radio Service (GPRS) multislot operation.
The PAM consists of an EGSM900 PA block, a DCS1800/PCS1900 PA block, impedance-matching circuitry for 50 Ω input and output, and bias control circuitry.
Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated on a single Gallium Arsenide (GaAs) die.
One PA block operates in the EGSM900 band and the other PA block supports both the DCS1800 and the PCS1900 bands.
Optimized for Li-Ion battery operation, both PA blocks share common power supply pins to distribute current.
A custom CMOS integrated circuit provides the internal interface circuitry, including a current amplifier that minimizes the required power control current (IAPC) to 10 µA, typical.
The GaAs die, the Silicon (Si) die, and passive comments are mounted on a multi-layer laminate substrate.
The assembly is encapsulated with plastic overmold.
The RF input and output ports are internally matched to 50 Ω to reduce the number of external components for a tri-band design.
Extremely low leakage current (2 µA, typical) of the dual PA module maximizes handset standby time.
The SKY77321 also contains band-select switching circuitry to select EGSM (logic 0) and DCS/PCS (logic 1) as determined from the Band Select (BS) signal.
In the block diagram shown below, the BS pin selects the PA output (DCS/PCS OUT or EGSM OUT) while the Analog Power Control (APC) controls the level of output power.
Features • High efficiency - EGSM900 53% - DCS1800 47% - PCS1900 47% • Input/output matching - 50 Ω internal • Small outline - 6 mm x 6 m...


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