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Skyworks Introduces Direct Conversion for 2.5G and 3G
November 20, 2002
Skyworks Solutions announced a single-chip direct conversion mixer
that significantly reduces the number of components required for
building a wireless base station receiver. The mixer is the first
of its kind to deliver very high linearity along with the cost and
space efficiencies of direct conversion technology for CDMA, WCDMA,
GSM, TDMA, 2.5G and 3G base stations.
Direct conversion replaces all intermediate frequency (IF) signal
conversion stages that are required with earlier superheterodyne
techniques, along with the costly discrete components associated
with the extra signal-conversion steps. This new, high-performance,
silicon bipolar complementary metal-oxide semiconductor (BiCMOS),
zero-IF mixer design utilizes new technology that significantly
reduces transceiver size, complexity and cost while supporting the
stringent performance requirements of wireless infrastructure applications.
"The majority of wireless infrastructure equipment manufacturers
are under pressure to reduce base station transceiver cost and size,
without compromising performance," said Mohy Abdelgany, vice president
of RF Subsystems at Skyworks. "Skyworks has leveraged its expertise
in direct conversion technology to create a small-footprint, high-performance
mixer solution that, depending on base station architecture, can
eliminate one or more down-conversion stages including image-reject
filters and other associated components."
"Our SKY73001 mixer further expands our wireless infrastructure
family of linear power amplifier modules, receiver front-ends/down-converters,
and dual fractional N frequency synthesizers," Abdelgany added.
"It also provides a key building block for extending the capabilities
of our front-end solutions so they can support direct conversion
technology with the superior linearity required for next-generation
base station designs."
Skyworks' SKY73001 device is a single-chip mixer designed specifically
to support industry-standard IS95 linearity specifications for base
station receivers. The SKY73001 also offers a wide RF and LO frequency
range of 2 MHz to 3500 MHz, within an IF range of 0 MHz to 100 MHz.
Designed to interface directly with analog-to-digital converters,
the SKY73001 includes differential, I&Q and IF outputs and operates
from a single +3.0V power supply. It features excellent LO-to-RF
and LO-to-IF isolation, and is manufactured using a proven, high-reliability
silicon BiCMOS process.
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3G Motorola A920
