Product category:
Communications ICs (Wireless)
News Release from: Fujitsu Microelectronics Europe | Subject: GPS/AGPS chipset
Edited by the Electronicstalk Editorial
Team on 26 July 2004
GPS chipset has a sensitive side
Fujitsu Microelectronics Europe (FME) has released a two-chip solution for high-sensitivity GPS/AGPS receivers capable of indoors acquisition.
Fujitsu Microelectronics Europe (FME) has released a two-chip solution for high-sensitivity GPS/AGPS receivers capable of indoors acquisition The Fujitsu chipset achieves high performance (sensitivity, accuracy and TTFF) with low power and a small PCB footprint
This article was originally published on Electronicstalk on 16 Feb 2001 at 8.00am (UK)
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The highly integrated solution consists of a baseband chip and an RF front end chip (supporting GPS L-band C/A code).
The baseband chip interfaces to a host CPU/MCU via a simple serial interface (UART).
Capable of operating in both "autonomous GPS/stand-alone" mode and "assisted GPS" mode, the chipset is designed to work in cellular handsets using any air interface such as UMTS/WCDMA, GSM/GPRS, PDC and CDMA technologies.
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It is versatile in that a receiver can be initially developed as an autonomous GPS receiver and subsequently software upgraded to AGPS when assistance becomes available.
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 employment of power-saving techniques with the 0.11um technology results in a peak baseband power dissipation of 67mW during low signal strength acquisition, while the continuous tracking (1Hz update rate) power dissipation is less than 40mW.
The acquisition/tracking engine on the chip has 44,000 effective correlators, resulting in high indoor sensitivity calibrated to -157.5dBm and indoor accuracy of better than 20m.
The chipset meets FCC-E911 requirements for October 2005.
The solution achieves fast TTFF of less than 1s when hot and around 32s when cold for outdoors fixes.
The baseband chip (MB87Q2040) incorporates a highly optimised GPS/AGPS baseband IP licensed from eRide.
eRide's patented and proven GPS/AGPS IP is based on extensive experience the company has gained in the GPS market.
The RF front-end chip (MB15H156), based on Fujitsu's BiCMOS process, integrates most RF-externals and features on-chip IF-filters, VCO, PLL, oscillators and LNA, resulting in a reduced BOM cost and component count and minimising the board area.
Fujitsu is also developing a CMOS RF front-end that will be introduced later this year.
The MB87Q2040 and MB15H156 are housed in 7 x 7mm 48-pin and 5 x 5mm 32-pin BCC plastic packages, respectively (keeping pin pitch at 0.5mm), giving a complete solution footprint of less than 100mm2.
The chipset operates over the industrial temperature range of -40 to +85C. Request a free brochure from Fujitsu Microelectronics Europe ...
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