SKY77527

Tx Front-end Module for Quad-Band GSM / EDGE

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 and GMSK modulation depending on the state of MODE control.

The Multi-function Control (MFC) provides “pinout” for interoperation with an external power control loop. The external circuit uses the Linear Detector output to provide closed loop power control in both EDGE and GMSK modes of operation. The power control loop together with the MFC will reduce sensitivity to antenna load, input drive, temperature, power supply, and process variation. The combined circuit configures the PA for fixed gain in 8PSK mode while providing the ability to optimize the PA bias at different power levels to maximize efficiency.

Product Summary

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Specifications

Frequency (MHz)
824-849
880-915
1710-1785
1850-1910

DescriptionTx FEM for Quad-Band GSM / EDGE
GSM850
GSM900
DCS1800
PCS1900

Typical Output Power (dbm) GSM/EDGE
-
-
-
-

Typical PAE (%) GSM
-
-
-
-

Supply Voltage (V)2.9-4.4 (GSM)
3.0-4.4 (EDGE)

PackageMCM, 34-pad

Package (mm)8 x 6 x 1.12

Features

High efficiency:
- GSM850
  38% @ 32.7 dBm
- GSM900
  38% @ 32.7 dBm
- DCS1800
  33% @ 30.9 dBm
- PCS1900
  31% @30.9 dBm
Low loss PHEMT RF antenna switch
Detector output: linear V/V
Small outline: 8 x 6 mm
Low profile: 1.12 mm Max.
Low VRAMP current

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