SKY77527-21 Skyworks Solutions, SKY77527-21 Datasheet
SKY77527-21
Manufacturer Part Number
SKY77527-21
Description
Front-End Module
Manufacturer
Skyworks Solutions
Datasheet
1.SKY77527-21.pdf
(2 pages)
www.datasheet4u.com
PRODUCT SUMMARY
SKY77527-21 Tx Front-End Module for Quad-Band
GSM / EDGE
Applications
• Quad-band cellular
Features
• High efficiency:
• Low loss PHEMT RF
• Detector output: linear V/V
• Small outline: 8 x 6 mm
• Low profile: 1.12 mm Max.
• Low V
handsets:
GMSK Modulation:
- Class 4 GSM850/900
- Class 1 DCS1800/
- Class 12 GPRS multi-slot
EDGE modulation:
- Class E2 GSM850/900
- Class E2 DCS1800/
- GSM850
- GSM900
- DCS1800
- PCS1900
antenna switch
PCS1900
operation
PCS1900
38% @ 32.7 dBm
38% @ 32.7 dBm
33% @ 30.9 dBm
31% @30.9 dBm
RAMP
current
201049A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 11, 2009
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
Description
The SKY77527-21 Tx Front End Module (FEM) is designed in a compact form factor for quad-band
cellular handsets comprising GSM850/900, DCS1800, PCS1900, supporting GMSK and linear EDGE
modulation. Class 12 General Packet Radio Service (GPRS) multi-slot operation is also supported.
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance-
matching circuitry for 50 Ω input and output impedances, a multifunction power amplifier control
(MFC) block, low pass harmonic rejection filters, and an SP6T Antenna T/R switch.
Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto an InGaP die; one
supports the GSM850/900 bands, the other supports the DCS1800/PCS1900 bands. The InGaP PA
die, the silicon MFC die, PHEMT switch die, and the passive components are mounted on a multi-layer
laminate substrate. The assembly is encapsulated with plastic overmold.
Band select (BS1 and BS2) circuitry is used to select the desired Tx and Rx frequency bands; MODE
circuitry selects GMSK modulation (logic 0) or EDGE modulation (logic 1); VRAMP controls the output
power for GMSK modulation; and VBIAS provides bias optimization for EDGE and GMSK modulation
depending on the state of MODE control.
The Multi-function Control (MFC) provides “pinout” for interoperation with an external power control
loop. The external circuit uses the Linear Detector output to provide closed loop power control in both
EDGE and GMSK modes of operation. The power control loop together with the MFC will reduce
sensitivity to antenna load, input drive, temperature, power supply, and process variation. The
combined circuit configures the PA for fixed gain in 8PSK mode while providing the ability to optimize
the PA bias at different power levels to maximize efficiency.
Figure 1. SKY77527-21 Functional Block Diagram
1
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SKY77527-21 Summary of contents
Page 1
... Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 11, 2009 Description The SKY77527-21 Tx Front End Module (FEM) is designed in a compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, PCS1900, supporting GMSK and linear EDGE modulation ...
Page 2
... Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Manufacturing Product Revision Part Number SKY77527-21 -21 Package Operating Temperature –20 °C to +85 °C ...