Title: A Single Die GPS, with Indoor Sensitivity - The NXP GNS7560
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.
Publication Year: 2008
Publication Date: 2008-09-19
Language: en
Type: article
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