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/dokumenty/skolni/diplomka/desctription.tex
95,7 → 95,7
 
An ultrasound AFE chips should be ideal for this purpose -- this chips has front-end amplifiers and filters integrated. But theirs drawback is incapability of handling differential input signal and relatively low dynamic range (consists 12bit ADC). This IO has many ADC channels thus scalling are possible in factor of 4 receivers (8 analog channels).
 
If we reduce range of usable chips by requirement of separate output for every analog channel and 16bit deph. Only several ADCs currently exists.
If we require separate output for every analog channel and 16bit deph. Only several ADCs currently exists which meet these requirements.
 
\begitems
*[[http://www.linear.com/product/LTC2271|LTC2271]]
102,7 → 102,7
*[[http://www.linear.com/product/LTC2191|LTC2190-2195]].
\enditems
 
All parts in this category are compatible with one board layout.
All parts in this category are compatible with one board layout. Main differences are in sampling frequency and signal to noise ratio. The slowest one has maximal sampling frequency 20 MHz. But all types have minimal sampling frequency 5 MSPS. All types were configurable over serial interface (SPI). SPI seems to be a standard for high-end ADC chips from main manufacturers (Analog Devices, Linear technology, Texas instruments, Maxim integrated..).
 
\secc ADC modules interface
 
/dokumenty/skolni/diplomka/diplomka.pdf
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/dokumenty/skolni/diplomka/diplomka.ref
36,8 → 36,8
\Xsec{2.5}{Achieved parameters }{7}
\Xpage{8}
\Xsecc{2.5.1}{Data reading and recording }{8}
\Xsecc{2.5.2}{ADC module parameters }{8}
\Xpage{9}
\Xsecc{2.5.2}{ADC module parameters }{9}
\Xpage{10}
\Xpage{11}
\Xchap{3}{Proposed final system }{11}
/dokumenty/skolni/diplomka/introduction.log
1,10 → 1,10
This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian) (format=pdfcsplain 2013.11.8) 14 APR 2014 23:16
This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian) (format=pdfcsplain 2014.4.19) 27 APR 2014 20:57
entering extended mode
restricted \write18 enabled.
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encTeX v. Jun. 2004, reencoding enabled
**introduction.tex
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(./introduction.tex The format: csplain <Nov. 2013>.
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23,8 → 23,8
\mathop
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{\rm sec}\nolimits
l.5 \sec
Actual radioastronomy problems
l.7 \sec
Typical Radio astronomy receiver
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you left one out. Proceed, with fingers crossed.
 
33,7 → 33,7
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l.8
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45,29 → 45,7
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Typical Radio astronomy receiver
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l.10
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Requirements
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l.12
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l.17 \secc
l.15 \secc
Sensitivity
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92,7 → 70,7
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l.21 \secc
l.19 \secc
Dynamic range
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101,7 → 79,7
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Bandwidth
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117,7 → 95,7
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l.29 \sec
System requirements
Current radioastronomy problems
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131,6 → 109,24
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l.31 ...uses proprietary digitalisation units \url
{http://arxiv.org/abs/1305...
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l.31 ...channel sound cadrd on amateur levels \url
{http://fringes.org/}
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<*> introduction.tex