SKY77457

• QPSK, 16QAM, 64QAM modulations
• Up to 20 MHz bandwidths
• Up to 100 resource blocks
• Linear power at 3.3 V
  - LTE: 25 dBm
  - WCDMA: 26 dBm
• Duplexer Tx-Rx attenuation and isolation: 50 dB
• Integrated Power Detector, interstage filter and duplexer
• Low voltage positive bias supply: 3.0 V to 4.6 V
• Supports low collector voltage operation down to 1.5 V
• Excellent linearity, efficiency
• Large dynamic range
• Low Profile 16-pad package: 4 mm x 7 mm x 1.05 mm
• Analog bias current control in low power mode using VBA pad
• InGaP BiFET Technology
• Skyworks Green? Packaging

Front-End Module for LTE / EUTRAN Band V (Tx 824-849 MHz), (Rx 869-894 MHz)

The SKY77457 Front-End Module (FEM) is a fully matched, 16-pad surface mount moduledeveloped for LTE/EUTRAN applications. Small and efficient, this LTE FEM integrates theinterstage filter, input and output matching, power amplifier, power detection, and duplexerinto a single 4 mm x 7 mm x 1.05 mm package. The SKY77457 meets the stringent spectrallinearity requirements of LTE with QPSK/16QAM modulations from 1.4 to 20MHz bandwidthand full or partial resource block allocations with high power added efficiency. The FEMincorporates Inter-Stage Filter and Duplexer, InGaP BiFET PA, and output power detector.

Integration of the RF front-end SKY77457 greatly simplifies the design of the 4G-compatible handsetradio or data card as all critical matching between the interstage filter, PA, power detection,and duplexer is optimized within the single module component. By optimizing the efficiencyof the InGaP BiFET PA MMIC, reducing RF loss between the integrated components andwithin the Duplexer itself, and improving the match between the PA and the Duplexer, thisFEM achieves low current at maximum output power that significantly reduces the powerdissipated in the LTE-enabled handsets or data cards. Primary bias to the SKY77457 issupplied via the VCC1 and VCC2 pads directly from a three-cell Ni-Cad, a single-cell Li-Ion,or other suitable batteries with outputs in the 3.0 to 4.6 volt range, while the bias network ispowered up with the VCCB pad. DC-DC converter operation can be supported with lowerpower operation down to 1.5V. Power down is accomplished by setting a logic low level onthe VEN pad. No external supply side switch of SKY77457 is needed as typical "off" leakage is 100microamperes with full primary voltage supplied from the battery. The VMODE pad of SKY77457 is used toswitch between high and low power modes to reduce current consumption and gain in theback off conditions. VBA is used to further control the current consumption in the lowpower mode.

This small package uses Skyworks' low cost, multi - layer laminate substrate technology andis approximately half the size of individually packaged component solutions. The SKY77457front-end module can save handset and data card designers significant board space anddesign-cycle time, and significantly simplify supply chain and sourcing of RF components.