SKY77552 Quad-Band Tx / Dual-Band Rx iPAC™ FEM for GSM / GPRS (824–915 MHz and 1710–1910 MHz)

The SKY77552 is a quad-band transmit and dual-band receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for cellular handsets comprising GSM and DCS/PCS operation. The FEM has quad-band capability in applications of U.S. or Euro dual-band platforms. Designed in a low profile, compact form factor, the SKY77552 offers a complete Transmit VCO-to- Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of a GSM PA block and a DCS/PCS PA block, impedance-matching circuitry for 50 Ω input and output impedances, Tx harmonics filtering, high linearity and low insertion loss PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM band and the other PA block supports the DCS/PCS band. Both PA blocks share common power supply pads to distribute current. The output of each PA block and the outputs to the two receive pads are connected to the antenna pad through PHEMT RF switches and a diplexer. The GaAs die, PHEMT die, Silicon (Si) die and passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold.

技术特性

High efficiency
- 43.5% GSM
- 37.5% DCS/PCS
Low transmit supply current
- 1.31 A GSM
- 0.96 A DCS/PCS
Internal ICC sense resistor for iPAC
Closed loop iPAC
50 Ω matched Input/Output
Tx–VCO-to-antenna and antenna-to-Rx-SAW filter RF interface
PHEMT RF switches afford high linearity, low insertion loss, and less than 20 μA supply current in receive modes
Small, low profile package
- 7 x mm 6 mm x 0.9 mm
Compatible with multiple logic families
Low VRAMP current: 25 μA

订购信息 Ordering Information

SKY77552

应用领域 APPLICATION

U.S. or Euro dual-band cellular handsets encompassing
- Class 4 GSM850/900
- DCS1800/PCS1900
- Class 12 GPRS multi-slot 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
SKY77552 数据资料DataSheet下载:pdf	Rev.V2	2 页