SKY77559

Tx Quad-Band / Rx Dual-Band BiFET iPAC™ FEM for GSM / GPRS (824-915 MHz and 1710-1910 MHz) w/ Triple WCDMA TRx Switch


SKY77559 is a transmit and receive Front-End Module (FEM) with Integrated Power Amplifier Control (iPAC™) designed in a low profile, compact form factor for dual-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900 operation. The SKY77559 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 GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedancematching circuitry for 50 ohm input and output impedances, Tx harmonics filtering, high linearity / low insertion loss RF switch, and a Power Amplifier Control (PAC) block with internal current sense resistor. Two Heterojunction Bipolar Transistor (HBT) PA blocks, a BiFET PAC, and switch control circuit are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM850/900 bands and the other PA block supports the DCS1800/PCS1900 bands. 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 an RF switch. The GaAs die, Switch die and passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold.
Band selection and control of transmit and receive are performed using four external control pads. Refer to the block diagram in Figure 1 below. The band select pad, BS, selects GSM850, GSM900, DCS, and PCS modes of operation.
Transmit enable TxEN controls receive or transmit mode of the RF switch (Tx = logic 1) and sets the turn-on threshold for VRAMP (VRAMP threshold = V(TxEN) ÷ 7). Proper timing between transmit enable TxEN and Analog Power Control VRAMP allows for high isolation between the antenna and Tx–VCO while the VCO is being tuned prior to the transmit burst.
The SKY77559 is compatible with logic levels from 1.2 V to 2.9 V for BS, TxEN, MODE, and VSW_EN pads.

Specifications

Frequency (MHz)

824-849
880-915
1710-1785
1850-1910
DescriptionTx Quad-Band / Rx Dual-Band BiFET iPAC™ FEM for GSM/GPRS
w/ Triple WCDMA TRx Switch
GSM850
GSM900
DCS1800
PCS1900
Typical Output Power (dBm) GSM

34.5
34.5
32.5
32.5
Typical PAE (%)

42
42
41
42
Supply Voltage (V)3.1-4.8
PackageMCM, 28-pin
Package (mm)6 x 6 x 0.9

Features

  • High efficiency: 42% (GSM850), 42% (GSM900), 42% (DCS1800), 41% (PCS1900)
  • Low transmit supply current: 1.36 A (GSM850), 1.36 A (GSM900), 0.86 A (DCS1800/PCS1900)
  • 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
  • RF switch affords high linearity, low insertion loss, and 0 V DC on Rx ports
  • Small, low profile package: 6 mm x 6 mm x 0.9 mm, 28-pad configuration

Product Documents

Applications

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