SKY77527-21 查看數據表（PDF） - Skyworks Solutions

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SKY77527-21

Tx Front-End Module for Quad-Band GSM / EDGE

Skyworks Solutions 

PRODUCT SUMMARY

SKY77527-21 Tx Front-End Module for Quad-Band

GSM / EDGE

Applications

• Quad-band cellular

handsets:

GMSK Modulation:

- Class 4 GSM850/900

- Class 1 DCS1800/

PCS1900

- Class 12 GPRS multi-slot

operation

EDGE modulation:

- Class E2 GSM850/900

- Class E2 DCS1800/

PCS1900

Features

• High efficiency:

- GSM850

38% @ 32.7 dBm

- GSM900

38% @ 32.7 dBm

- DCS1800

33% @ 30.9 dBm

- PCS1900

31% @30.9 dBm

• Low loss PHEMT RF

antenna switch

• Detector output: linear V/V

• Small outline: 8 x 6 mm

• Low profile: 1.12 mm Max.

• Low VRAMP current

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

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201049A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 11, 2009

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