A new chipset for the high-sensitivity GPS/AGPS receivers required in communications systems that support telematics and navigation applications for mobile location, tracking and monitoring achieves the industry's highest levels of sensitivity, accuracy and Time-to-First-Fix (TTFF) with low power and a small PCB footprint.
The chipset consists of a baseband chip, the MB87Q2040, which interfaces to a host CPU/MCU via an UART serial interface; and an RF front-end chip, the MB15H156, which supports GPS L-band C/A code. Capable of operating in both "autonomous GPS/standalone" mode and "assisted GPS" mode, the chipset supports leading air interfaces, including UMTS/WCDMA, GSM/GPRS, PDC and CDMA. The chipset is also versatile: a receiver can be initially developed as an autonomous GPS receiver and subsequently upgraded through software to AGPS when assistance becomes available.
Demand for GPS products and services has increased recently and the new chipset has been developed specifically to meet the industry's requirements for low power, small footprint, and reduced materials costs.
The MB87Q2040 baseband chip incorporates highly optimized GPS/AGPS baseband IP that has been licensed from eRide Inc., based in San Francisco. eRide's patented and proven GPS/AGPS IP is based on the company's extensive experience in the GPS market. Using power-saving techniques with the 0.11um technology results in a peak baseband power dissipation of only 67mW during low signal strength acquisition, while power dissipation is less than 40mW while continuous tracking is at a 1Hz update rate.
The acquisition/tracking engine on the chip has 44,000 effective correlators, resulting in high indoor sensitivity calibrated to -157.5dBm, with indoor accuracy of less than 20m. The chipset meets FCC-E911 requirements for October 2005, and achieves fast TTFF of less than 1 second when hot and around 32 seconds when cold for outdoor fixes.
The MB15H156 RF front-end chip is built using Fujitsu's BiCMOS process, which integrates most RF-externals, and features on-chip IF-filters, VCO, PLL, oscillators and LNA. The result is a low BOM cost and component count that also minimizes board area.
Fujitsu provides a software library (API) for interfacing to the application software layer. The control software on the host CPU is processor- and OS-independent, running as a single thread requiring no real-time interrupts, RTOS or host libraries.
The MB87Q2040 and MB15H156 samples are now available in 7x7mm 48-pin and 5x5mm 32-pin BCC plastic packages, respectively, with pin pitch at 0.5mm, delivering a total footprint of below 100 square millimeters. The chipset operates over the industrial temperature range of -40 to +85 degrees C.
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