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Deviation from linear phase

Question asked by elapla on Mar 12, 2012
Latest reply on Apr 17, 2012 by elapla

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I am trying to write the equations to generate a plot of deviation from linear phase. I am sure this is not a stock feature (e.g. standard output format) but I am hoping there is enough capability in the equation scripting. I have not had a lot of success so far. Could anyone provide some code (or a working wsx)?
Attached is what a plot would look like.
Thanks

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phase linearity.wsx287.8 KB

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wrivas Mar 20, 2012 11:36 AM
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There is a function called dev_lin_phase() that you can use.

Syntax
z = dev_lin_phase( x , y )

Definition
Returns a vector in radians of deviation from the linear phase. Parameter x is the dependent vector and parameter y is the independent vector. Parameters must be vectors.

Example:
using("Linear1_Data")
data3=dev_lin_phase(S[2,1],F)
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- elapla @ wrivas on Apr 13, 2012 11:47 AM
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  I have typed this in exactly as shown below. I get an error message (attached)
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  - wrivas @ elapla on Apr 16, 2012 8:09 AM
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    My apologies I made a typo on the data3 expression, it should be:
    
    data3=dev_lin_phase(S[[2,1]],F)
    
    Notice the square brackets used for S21, i.e. S[[2,1]]
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    - elapla @ wrivas on Apr 17, 2012 5:25 AM
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      Does this code evaluate the the s21 phase response from the data file? It looks like it is evaluating the s21 magnitude response.
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      - wrivas @ elapla on Apr 17, 2012 8:36 AM
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        The dev_lin_phase() views the S21 as a complex quantity and therefore extracts the phase information needed to give you the deviation from linear phase in degrees.
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        elapla @ wrivas on Apr 17, 2012 9:20 AM
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        please see attached workspace. the linear simulation (with manually added group delay to "flatten" phase response as much as possible) shows what a deviation from linear phase plot would look like. I am missing how to use the equation function to display the same plot.
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        phase linearity.wsx347.4 KB
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Deviation from linear phase

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