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Ultraminiature GPS RF Module for Cellular Systems
CXA3355Z
GPS (Global Positioning System) functionality is now often included
in mobile equipment such as cellular phones and digital still cameras,
resulting in increasing desires for further miniaturization and
further reductions in the number of external components required in
GPS devices.
At the same time as adopting single conversion as the frequency
conversion method, the CXA3355Z incorporates all of the two SAW
filters, the LNA, and the passive components (inductors, capacitors,
and resistors) in the package itself. Thus Sony has achieved RF
downconverter functionality in a single package with no external components. |
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CXA3355Z |
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* Includes all required components, including
the SAW filters, the LNA, and
the passive components (inductors,
capacitors, and resistors) in the package
itself
* Total gain ≥100 dB, TTL NF ≈3 dB
* Ultraminiature package
6.3 mm (L) × 6.15 mm (W) × 1.3 mm (T) |
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All External Components
Integrated in the Package |
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The CXA3355Z is an RF module that, in
addition to the passive components, about
thirty inductors, capacitors, and resistors,
also integrates two SAW filters and a low-noise
amplifier in the same package,
achieving the ultraminiature size of 6.3
mm × 6.15 mm × 1.3 mm.
Components such as the matching components,
the PLL loop filter, and the
bypass capacitors are all integrated in the
package and shielded in a metal case.
By integrating two SAW filters and a low-noise
amplifier, the CXA3355Z is able to
achieve superb interference rejection characteristics, a total gain of 100 dB or higher,
and a TTL NF of about 3 dB. The
CXA3355Z can contribute significantly to
GPS block simplification. |
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RF IC Implemented in Sony’s
0.25 µm SiGe BiCMOS Process |
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The RF IC used in the CXA3355Z combines
both SiGe HBT and 0.25 µm CMOS
devices and achieves both the ultralow
power consumption optimal for mobile
equipment by combining this high-potential
process technology with Sony’s
circuit technology as well as improved
sensitivity by integrating a low-noise
amplifier on the same chip.
The system adopts the single conversion
method and includes both a high-sensitivity
low-noise amplifier and a newly-developed
image rejection mixer that
achieves a high image rejection ratio. The
PLL circuit features a programmable
structure and supports a wide variety of
TCXO frequencies in the 10 to 26 MHz
range. The power-on reset function is
enabled and bus control is not required at
representative TCXO frequencies (13,
16.368, and 18.414 MHz). Single-bit digital
output was selected as the output format.
The CXA3355Z supports interface
at levels from 1.6 to 3.3 V. |
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Ultraminiature Package |
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Sony achieved extreme miniaturization to
a mere 6.3 mm × 6.15 mm ×1.3 mm in
the CXA3355Z, which includes all the required
components in a single package. In
addition to the CXA3355Z RF module,
Sony also provides a lineup including the
CXA3355ER 5.1 mm × 5.1 mm × 0.8
mm RF IC provided in a 44-pin VQFN
package, and the CXA3355TQ, which is
an alternative package version of the
CXA3355ER and which adopts a 48-pin
TQFP package with an easy-to-mount 0.5
mm lead pitch.
In addition, the CXA3355ER/TQ feature
a built-in antenna sensing function that
automatically determines whether or not
an antenna is connected. |
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•••• Mr. NAGASE••••
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While the market for portable
equipment with GPS functionality
is expected to grow rapidly in the
future, we hope to achieve even
further reductions in power consumption
and improvements in
performance. Since we are committed
to developing products that
will satisfy our customers’ needs
in this area, you can look forward
to an ever expanding line of GPS
products from Sony in the future. |
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See
all articles with figures and tables.  |
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Vol.41 |
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