phase VS frequency block !!!

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al-comm
al-comm 2011-7-21
Hello,
I’m looking for a block that it can show me the phase of a signal (rad) versus the frequency (Hz), for example a block similar at the spectrum scope but the y axis is the phase (rad) and not the gain (dB). Thanks a lot, Be good.

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Rick Rosson
Rick Rosson 2011-7-21
FFT and Phase/Magnitude Blocks
You can use the "FFT" block to convert the signal from the time-domain to the frequency domain, followed by the "Complex to Magnitude-Angle" block to compute the phase in radians. If you know the sampling rate, you can compute the corresponding frequency doemain, and then plot the phase versus frequency using the "XY Graph" scope block.
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al-comm
al-comm 2011-7-21
Hello,
Ok, what i want to see is:
X axis: frequencies (Hz)
Y axis: phase (rad)
But i want to see a graph similar at the graph added in my comment upstairs and not the XY graph because it’s not showing the different frequencies.
In my graph, at 1 GHz (1*10^9) I’m supposing find this value 1.57 rad ( 900 ) and not 0.94.
So I’m asking why this value is not correct if I’m using only the “complex to phase “ block and “ to work space “ to be plotted in Matlab?! And if there’s a method or block to see this type of graphs without using a Matlab code !?
Thanks again.
al-comm
al-comm 2011-7-21
correction: 1.57 rad or ( 90 degrees) not (900)

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Rick Rosson
Rick Rosson 2011-7-21
MATLAB Function Block
Another possibility would be to use the MATLAB Function Block (R2011a or later) or the Embedded MATLAB Function Block (R2010b or earlier) to compute the FFT and to plot the phase versus the frequency. Again, you will need to know the sampling rate to be able to compute the frequency domain.

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