MLABlibrarysvnkaklikMLAB_E8magsvn

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/dokumenty/skolni/diplomka/description.tex
22,7 → 22,6
We calculate minimum data bandwidth data rate for eight receivers, 2 bytes per sample and 5MSPS as $8 * 2 * 5e6 = 80$ MB/s. Such data rate is at the limit of real writing speed o classical HDD and it is almost double of real bandwidth of USB 2.0 interface.
\sec System scalability
192,15 → 191,12
\secc ADC module parameters
Two pieces of ADC modules were completed and tested. The first piece, labeled ADC1, has LTC21190
ADC chip populated with LT660015 front-end operational amplifier. It also has a 1kOhm resistors populated on inputs which gives it an ability of an internal attenuation of input signal. The value of this attenuation $A$ is described by the following formula
ADC chip populated with LT6600-5 front-end operational amplifier. It also has a 1kOhm resistors populated on inputs which gives it an ability of an internal attenuation of input signal. The value of this attenuation $A$ is described by the following formula
$$
A = {1580 \times R_1 \over R_1 + R_2}
$$
\midinsert
\picw=15cm \cinspic ./img/screenshots/ADC1_CH2_FFT.png
\caption/f Sine signal from ADC1 module with LTC21190 and LT6600-5 devices.
\caption/f Sine signal sampled by ADC1 module with LTC21190 and LT6600-5 devices.
\endinsert
207,27 → 203,41
ADC1 CH1 maximal input 705.7 mV
$$
A = {1580 \times R_1 \over R_1 + R_2}
$$
Where is
\begitems
* $A$ - Gain of input aplifier.
* $R_1$ - Output impedance of signal source (usually 50 Ohm).
* $R_2$ - Value of serial resitors at operational apmlifier inputs.
\enditems
\midinsert
\picw=15cm \cinspic ./img/screenshots/ADC1_CH2_FFT.png
\caption/f Sine signal from ADC1 module with LTC21190 and LT6600-5 devices.
\picw=15cm \cinspic ./img/screenshots/ADC2_CH1_FFT.png
\caption/f Sine signal sampled by ADC2 module with LTC2271 and LT6600-2.5 devices.
\endinsert
LTC2271
6600125
1k
ADC2 CH1 maximal input 380 mV
$$
D.R. = N * b *
A = {806 \times R_1 \over R_1 + R_2}
$$
Where is
\begitems
* N - number of receivers
* Mi
* $A$ - Gain of input aplifier.
* $R_1$ - Output impedance of signal source (usually 50 Ohm).
* $R_2$ - Value of serial resitors at operational apmlifier inputs.
\enditems
Both images confirms that ADC modules have input dynamical range 80 dB at least.
\chap Example of usage

/dokumenty/skolni/diplomka/diplomka.pdf
Cannot display: file marked as a binary type.
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/dokumenty/skolni/diplomka/introduction.tex
79,7 → 79,7
Historically, the parameter of bandwidth in radioastronomical receiver used to be within the kilohertz range. Small bandwidth was acceptable because observations were processed directly by listening or by paper chart intensity recorder. Chart recorder integrated energy of signal over defined small bandwidth which was suitable for detecting the intensity variance of microwave background. No wideband transmitters existed in that era (except for TV transmitters) and tuning to other neighbouring frequency was easy as they were mostly vacant. Parallel observations from several places were unnecessary as well because the electromagnetic conditions were nearly same at all locations.
% dopsat
% dopsat navaznost na aktualne pouzivane digitalizacni jednotky
The system requires proper handling of huge amounts of data.