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New GPS Receiver IC allows accuracy to Less Than 0.5m
Maxim's new MAX2740 will offer greater accuracy and improved timing over previous designs.
The
MAX2740 is a complete global positioning system (GPS) receiver from antenna
output to digitizer input. The signal path includes the LNA, two downconverters,
and variable-gain and fixed-gain amplifiers. By utilizing a double-conversion
superheterodyne architecture with external surface acoustic wave (SAW) filters,
high levels of image rejection and blocking immunity are possible. Receiver
linearity has been maximized to improve operation in hostile RFI environments
found in cellular base stations. The MAX2740 also includes a high-performance
voltage-controlled oscillator (VCO) with low phase noise for subcentimeter
carrier phase applications, and a fixed-frequency synthesizer for generation of
all required on-chip local oscillators.
The unique frequency plan captured in the MAX2740 is suitable for joint
GPS/GLONASS receivers with minimal external components. This allows the MAX2740
to provide a cost-effective and high-performance solution for navigation and
timing products that need maximum satellite availability.
The MAX2740 is compatible with a high-performance DSP engine capable of very
fast time to first fix and excellent multipath
rejection.
Features
High Selectivity for Hostile Base Station Environments
Complete Antenna-to-Baseband Receiver Solution
>100dB Total Receiver Gain Including All Filter Losses
>50dB Automatic Gain Control (AGC) Range
Fully Balanced Topology for Minimum Spurious Responses
Low Phase Noise VCO for Carrier Phase Applications
Compatible with High-Performance Companion DSP
The company's Web site address is http://www.maxim-ic.com/.
[Reprinted with kind permission from Maxim]
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