Description
The SKY77529 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, a printed directional coupler for each block impedance-matching circuitry for 50 Ω input and output impedances, a multifunction power amplifier control (MFC) block, low pass harmonic rejection filters, and an SP8T Antenna T/R switch. The T/R switch incorporates four linear ports to allow WCDMA parallel operation.

FEATUREs
• WCDMA pass-through
   - 4 linear ports
• TRP-compliant design
• SPI bus support
• Low loss PHEMT RF antenna switch
• Detector output: linear V/V
• Closed loop GMSK mode power control
• Small, low profile package
   - 7.5 x 7.0 x 0.9 mm MAX.
   - 26-pad configuration
• Gold-plated, lead-free contacts
• Low VRAMP current

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