PRODUCT SUMMARY
SKY77458 Front-End Module for LTE / EUTRAN Band VIII
(Tx 880-915 MHz), (Rx 925-960 MHz)
Applications
•
Long-Term Evolution (LTE)
•
Evolved Universal Terrestrial Radio
Access Network (EUTRAN)
•
Handsets and Data Cards
Description
The SKY77458 Front-End Module (FEM) is a fully matched, 16-pad surface mount module
developed for LTE/EUTRAN applications. Small and efficient, this LTE FEM integrates the
interstage filter, input and output matching, power amplifier, power detection, and duplexer
into a single 4 mm x 7 mm x 1.1 mm package.
The SKY77458 meets the stringent spectral linearity requirements of LTE with QPSK / 16QAM
modulations from 1.4 to 20 MHz bandwidth and full or partial resource block allocations with
high power added efficiency. The FEM incorporates Inter-Stage Filter and Duplexer, InGaP
BiFET PA, and output power detector.
Integration of the RF front-end greatly simplifies the design of the 4G-compatible handset
radio 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 efficiency
of the InGaP BiFET PA MMIC, reducing RF loss between the integrated components and
within the Duplexer itself, and improving the match between the PA and the Duplexer, this
FEM achieves low current at maximum output power that significantly reduces the power
dissipated in the LTE-enabled handsets or data cards.
Primary bias to the SKY77458 is supplied via the VCC1 and VCC2 pads directly from a three-
cell Ni-Cad, a single-cell Li-Ion, or other suitable battery with output in the 3.0 V to 4.6 V
range, while the bias network is powered up with the VCCB pad. DC-DC converter operation
can be supported with lower power operation down to 1.5 V.
Power down is accomplished by setting a logic low level on the VEN pad. No external supply
side switch is needed as typical “off” leakage is 10 μA with full primary voltage supplied
from the battery (VBA = 0 V). The VMODE pad is used to switch between high and low power
modes to reduce current consumption and gain in the back-off conditions. VBA is used to
further control the current consumption in the low power mode.
This small package uses Skyworks’ low cost, multi-layer laminate substrate technology and
is approximately half the size of individually packaged component solutions. The SKY77458
front-end module can save handset and data card designers significant board space and
design-cycle time, and significantly simplify supply chain and sourcing of RF components.
Features
•
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 1.1 mm
•
Analog bias current control in low
power mode using VBA pad
•
InGaP BiFET Technology
•
Skyworks Green™ Packaging
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201026B • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • June 8, 2010
1
Ordering Information
Model Number
SKY77458
Manufacturing Part Number
SKY77458
Product Revision
Package
MCM 4 x 7 x 1.1 mm
Operating Temperature
–20
°C
to 85
°C
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