SKY77527中文资料Tx Front-end Module for Quad-Band GSM / EDGE数据手册Skyworks规格书

描述 Description

The SKY77527-21 Tx Front-End Module (FEM) is designed in a compact form factor for quad-bandcellular handsets comprising GSM850/900, DCS1800, PCS1900, supporting GMSK and linear EDGEmodulation. 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, impedancematchingcircuitry 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; onesupports the GSM850/900 bands, the other supports the DCS1800/PCS1900 bands. The InGaP PAdie, the silicon MFC die, PHEMT switch die, and the passive components are mounted on a multi-layerlaminate 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; MODEcircuitry selects GMSK modulation (logic 0) or EDGE modulation (logic 1); VRAMP controls the outputpower for GMSK modulation; and VBIAS provides bias optimization for EDGE and GMSK modulationdepending on the state of MODE control.

The Multi-function Control (MFC) provides “pinout” for interoperation with an external power controlloop. The external circuit uses the Linear Detector output to provide closed loop power control in bothEDGE and GMSK modes of operation. The power control loop together with the MFC will reducesensitivity to antenna load, input drive, temperature, power supply, and process variation. Thecombined circuit configures the PA for fixed gain in 8PSK mode while providing the ability to optimizethe PA bias at different power levels to maximize efficiency.

特性 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

应用 Application

• Smartphones