A Single Die GPS, with Indoor Sensitivity - The NXP GNS7560

T. Haddrell, J.P. Bickerstaff, M. Conta

Abstract:	GPS receivers are becoming a regular feature of cellphones, with numbers climbing into many millions. These applications require very low cost with high performance and tight specification control. A single-chip implementation using a leading edge technology is a desirable target, minimizing, as it does, both space and power consumption. This paper introduces a new product from ST-NXP – the single die GNS7560 chip. This chip provides a hosted GPS function (using the powerful microprocessor already embedded in most electronic equipment) in the smallest space, and at low cost. The paper will describe the architectural decisions that lead to the hosted approach, and the detailed make-up of the measurement engine, with its many parallel correlators, embedded DSP, and the CMOS single-downconvert image-reject radio. The co-location of radio with a digital baseband is a significant technological hurdle. Important design features and considerations, such as noise figure, required to achieve the single chip GPS will be highlighted. Finally some performance parameters will be presented, to demonstrate that GNS7560 successfully implements the single-chip GPS goal, whilst retaining the allimportant high-sensitivity performance.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1201 - 1209
Cite this article:	Haddrell, T., Bickerstaff, J.P., Conta, M., "A Single Die GPS, with Indoor Sensitivity - The NXP GNS7560," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1201-1209.
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