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Tags: the global posit, global positioning system uses, what is global positioning system used for, global positioning system used, global positioning system uk, global positioning system university, global positioning system user manual, global positioning system usage, global positioning system usa, global positioning system usaf, global positioning system user segment, global positioning system application, global positioning system and surveying, global positioning system auto, global positioning system antenna,
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31-05-2012, 05:06 PM
Post: #21
RE: Global positioning system report and ppt
GLOBAL Positioning System

.pdf  GLOBAL Positioning System.pdf (Size: 378.36 KB / Downloads: 9)


GLOBAL Positioning System (GPS) receivers for the consumer
market require solutions that are compact, cheap, and low power.
Manufacturers of cellular telephones, portable computers, watches, and other
mobile devices are looking for ways to embed GPS into their products. Thus,
there is a strong motivation to provide highly integrated solutions at the lowest
possible power consumption. GPS radios consist of a front-end and a digital
baseband section incorporating a digital processor. While for the baseband
processor, cost-reduction reasons dictate the use of the most dense digital
CMOS technology, for the front-end, the best option in terms of power
consumption is a SiGe BiCMOS technology.


The GPS signal code is a direct-sequence spread spectrum, and the type
of spread spectrum employed by GPS is known as binary phase-shift keying
direct-sequence spread spectrum (BPSK DSSS). In a spread-spectrum system,
data are modulated onto the carrier such that the transmitted signal has a larger
bandwidth than the information rate of the data. The term “direct sequence” is
used when the spreading of the spectrum is accomplished by phase modulation
of the carrier.


As stated, the overall design has been geared to a high level of
integration and reduction of silicon area at the lowest possible power
consumption. Below, the detailed design choices in the various sections are
RF Section
The LNA has been designed to have a very low noise since it sets a lower
bound for the total receiver sensitivity. A high voltage gain is necessary to
sufficiently reduce the noise contribution of the following mixers.
A common source configuration with inductive degeneration provides
high voltage gain and low NF, as shown in Fig. 3. In fact, in a narrow band,
this structure allows achieving a noise factor close to the theoretical minimum.
31-07-2012, 09:50 AM
Post: #22
RE: Global positioning system report and ppt

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