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The Industry's First 1-Chip
GPS Receiver Incorporates Sony's Unique RF Technologies
CXD2951GA/GH/GL
The global positioning system (GPS), which uses artificial
satellitects that dot the sky, is mainly used in car
navigation systems. Sony has achieved improved sensitivity,
faster processing, and lower power to bring GPS functionality
to the cellular phones and other mobile equipment
that we use in our daily lives, and is now releasing
the industry's first 1-chip CMOS GPS LSI that includes
a built-in RF circuit. |
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CXD2951GA/GH/GL |
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* 1-chip CMOS GPS LSI independently
developed by Sony
* High-performance GPS LSI that achieves improved sensitivity,
faster processing, and lower power
* Supports a wide range of applications
* The industry's smallest GPS module developed |
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1-chip CMOS GPS LSI Independently
Developed by Sony |
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Figure 1 presents a simplified
block diagram of the CXD2951GA/GH/GL. The RF/IF unit
is the industry's first high-frequency circuit designed
in the same fabrication process technology as the digital
block using Sony's RFCMOS technology. This circuit receives
1.5 GHz GPS signal with the front-end LNA, and after
mixing, passes a 1 MHz signal to the baseband system.
This circuit strives for minimal power consumption by
using a high-sensitivity comparator and circuit structure
simplification. Interference from digital noise was
reduced by layout improvements. In the baseband unit,
Sony developed a unique new architecture that separates
the acquisition block from the tracking block. Separating
these blocks allowed the development of optimal algorithms,
and enables the device to achieve highct performance.
The control block performs optimized power management
to achieve even lower power consumption. In addition,
the device provides an external bus, GPIO, UART, USB
1.1, and built-in RTC circuits, thus integrating all
the functions required for GPS on a single CMOS chip.
Thus this device can be used to implement an ultraminiature,
low cost GPS receiver. |
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High-Performance GPS LSI that
Achieves Improved Sensitivity, Faster Processing, and
Lower Power |
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The CXD2951GA/GH/GL achieves
the high tracking sensitivity of -150 dBm, and is capable
of reception even indoors. In combination with its hot
start positioning time of 2 to 5 seconds and its low
power of 50 mW (intermittent positioning) during tracking,
it is an extremely high-performance GPS LSI. |
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Supports a Wide Range of Applications |
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The CXD2951GA/GH/GL features
a TCXO circuit that supports arbitrary frctequencies from
10 to 30 MHz and is thus highly compatible with a wide
range of applications. It also supports simple connection
using a serial interface allowing GPS functionality
to be included in a small space. Sony provides an extensive
API as software support for this device, and it can
also support network assisted GPS operation. In addition
to conventional GPS functionality, this software also
supports WAAS. |
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The Industry's Smallest GPS Module
Developed |
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Sony has now developed the
industry's smallest surface mounting GPS module with
a mounting area of only 322 mm2
. Sony is also proceeding with the development of a
QS9000 conforming automotive module as well to respond
to a wide range of user needs. |
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•••• Mr.SAWADA ••••
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In designing the CXD2951GA/GH/GL,
a great many people from research labs and design and
development groups worked together forming a powerful
team that crossed over organizational boundaries with
the slogan "best in the world!". Although
difficult days with many all night sessions continued
as we resolved problem after problem, we are confident
that this IC represents the crystallization of the whole
range of Sony technologies and that it achieves the
industry's highest level of GPS performance. From now
on, no one need worry about becoming lost, wherever
in the whole wide world they may be. |
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See all articles with figures
and tables.  |
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Vol.33 |
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