SKY77527-21

PRODUCT SUMMARY SKY77527-21 Tx Front-End Module for Quad-Band GSM / EDGE www.datasheet4u.com 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 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, impedancematching 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 ...