SKY77551 Tx-Rx FEM for Quad-Band GSM / GPRS / EDGE – Triple-Band WCDMA Antenna Switch Support

SKY77551 is a transmit and receive Front End Module (FEM) designed in a very low profile (0.9 mm) and compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation — a complete transmit VCO-to-Antenna and Antenna-toreceive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation and linear EDGE operation. WCDMA switch-through support is provided by three dedicated high-linearity ports. The module consists of a GSM850/900 PA and DCS1800/PCS1900 PA block, impedancematching circuitry for 50 Ω input and output impedances, Tx harmonic filtering, a high linearity/low insertion loss switch, and a CMOS Power Amplifier Control (PAC) block. A custom silicon integrated circuit contains decoder circuitry to control the RF switch while providing a low current, external control interface. Fabricated in InGaP/GaAs, the Heterojunction Bipolar Transistor (HBT) PA blocks support the GSM850/900 bands and DCS1800/PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The output of the PA block and the outputs to the seven receive pads connect to the antenna pad through a high-linearity antenna switch. The WCDMA and Rx ports feature a 0 volts DC offset level which eliminates the need for external blocking capacitors. The InGaP/GaAs die, switch die, Silicon (Si) controller die, and passive components are mounted on a multi-layer laminate substrate and the entire assembly is encapsulated with plastic overmold.

技术特性

Small, low profile package
- 6 mm x 6 mm x 0.9 mm
- 28-pad configuration
Low input power range
- –1 to 6 dBm
High efficiency
- 41.0% GSM850
- 42.0% GSM900
- 38.5% DCS1800
- 38.5% PCS1900
Tx-VCO-to-antenna and antennato-Rx-SAW filter RF interface
Tx harmonics below –38 dBm
Current limiting for over-voltage protection and extended battery life
Input/Output matched internally to 50 Ω
High impedance control inputs: 20 μA, maximum
Input control circuitry built-in for improved TRP variation

订购信息 Ordering Information

SKY77551

应用领域 APPLICATION

Quad-band cellular handsets encompassing
- Class 4 GSM850/900
- Class 1 DCS1800/PCS1900
- Class 12 GPRS multi-slot operation
- Triple band WCDMA antenna switch support
- Linear EDGE operation

功能框图 Functional Block Diagram

应用技术支持与电子电路设计开发资源下载	版本信息	大小
SKY77551 数据资料DataSheet下载:pdf	Rev.V2	2 页