What does actually the “unravel branch wrap” option do to the phase plot in LTspice?











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Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:



enter image description here



enter image description here



What does this option do to the phase plot?






ltspice phase bode-plot







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  • Note that +180° == -180°.
    – Jonathon Reinhart
    Nov 26 at 15:39















up vote
4
down vote

favorite
1












Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:



enter image description here



enter image description here



What does this option do to the phase plot?






ltspice phase bode-plot







share|improve this question






















  • Note that +180° == -180°.
    – Jonathon Reinhart
    Nov 26 at 15:39













up vote
4
down vote

favorite
1









up vote
4
down vote

favorite
1






1





Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:



enter image description here



enter image description here



What does this option do to the phase plot?






ltspice phase bode-plot







share|improve this question













Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:



enter image description here



enter image description here



What does this option do to the phase plot?






ltspice phase bode-plot




ltspice phase bode-plot






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 26 at 9:49









user16307

4,7862395183




4,7862395183












  • Note that +180° == -180°.
    – Jonathon Reinhart
    Nov 26 at 15:39


















  • Note that +180° == -180°.
    – Jonathon Reinhart
    Nov 26 at 15:39
















Note that +180° == -180°.
– Jonathon Reinhart
Nov 26 at 15:39




Note that +180° == -180°.
– Jonathon Reinhart
Nov 26 at 15:39










1 Answer
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It adds or subtracts multiples of $2pi$ (360 degrees) to each point in the phase plot so that the phase is plotted continuously rather than having jumps in it.



We know that physically the phase is going to be continuous from frequency to frequency. However as the output of the analysis is a vector gain at each frequency, all angles are reduced to the base range of +/- 180 degrees, so the graph has no way of knowing at any one frequency how many times phase has wrapped around the circle.






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    1 Answer
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    active

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    up vote
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    down vote



    accepted










    It adds or subtracts multiples of $2pi$ (360 degrees) to each point in the phase plot so that the phase is plotted continuously rather than having jumps in it.



    We know that physically the phase is going to be continuous from frequency to frequency. However as the output of the analysis is a vector gain at each frequency, all angles are reduced to the base range of +/- 180 degrees, so the graph has no way of knowing at any one frequency how many times phase has wrapped around the circle.






    share|improve this answer



























      up vote
      8
      down vote



      accepted










      It adds or subtracts multiples of $2pi$ (360 degrees) to each point in the phase plot so that the phase is plotted continuously rather than having jumps in it.



      We know that physically the phase is going to be continuous from frequency to frequency. However as the output of the analysis is a vector gain at each frequency, all angles are reduced to the base range of +/- 180 degrees, so the graph has no way of knowing at any one frequency how many times phase has wrapped around the circle.






      share|improve this answer

























        up vote
        8
        down vote



        accepted







        up vote
        8
        down vote



        accepted






        It adds or subtracts multiples of $2pi$ (360 degrees) to each point in the phase plot so that the phase is plotted continuously rather than having jumps in it.



        We know that physically the phase is going to be continuous from frequency to frequency. However as the output of the analysis is a vector gain at each frequency, all angles are reduced to the base range of +/- 180 degrees, so the graph has no way of knowing at any one frequency how many times phase has wrapped around the circle.






        share|improve this answer














        It adds or subtracts multiples of $2pi$ (360 degrees) to each point in the phase plot so that the phase is plotted continuously rather than having jumps in it.



        We know that physically the phase is going to be continuous from frequency to frequency. However as the output of the analysis is a vector gain at each frequency, all angles are reduced to the base range of +/- 180 degrees, so the graph has no way of knowing at any one frequency how many times phase has wrapped around the circle.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Nov 26 at 17:08

























        answered Nov 26 at 10:20









        Neil_UK

        72.5k274159




        72.5k274159






























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