SKY77344

PRODUCT SUMMARY SKY77344 PA 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 51% @ 34.5 dBm - GSM900 50% @ 34.5 dBm - DCS1800 50% @ 32.5 dBm - PCS1900 48% @ 32.5 dBm Input/Output matching 50 Ω internal (with DC blocking) Integrated Couplers and Detector Detector Output Linear dB/V 20-pad MCM Small outline: 5 x 5 mm Low profile: < 1 mm Description The SKY77344 Power Amplifier Module (PAM) 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, and a Multi-function Power Amplifier Control (MFC) block. A custom BICMOS integrated circuit provides the internal MFC function and interface circuitry. Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto a single InGaP die; one supports the GSM850/900 bands, the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The InGaP die, the silicon die, and the passive components are mounted o...