What does actually the “unravel branch wrap” option do to the phase plot in LTspice?
$begingroup$
Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:
What does this option do to the phase plot?
ltspice phase bode-plot
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
$endgroup$
add a comment |
$begingroup$
Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:
What does this option do to the phase plot?
ltspice phase bode-plot
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
$endgroup$
$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39
add a comment |
$begingroup$
Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:
What does this option do to the phase plot?
ltspice phase bode-plot
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
$endgroup$
Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot:
What does this option do to the phase plot?
ltspice phase bode-plot
ltspice phase bode-plot
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
asked Nov 26 '18 at 9:49
user16307user16307
4,98926102201
4,98926102201
$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39
add a comment |
$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39
$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39
$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39
add a comment |
1 Answer
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$begingroup$
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.
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
$endgroup$
add a comment |
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1 Answer
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$begingroup$
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.
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
$endgroup$
add a comment |
$begingroup$
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.
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
$endgroup$
add a comment |
$begingroup$
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.
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
$endgroup$
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.
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
edited Nov 26 '18 at 17:08
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
answered Nov 26 '18 at 10:20
Neil_UKNeil_UK
78.5k285182
78.5k285182
add a comment |
add a comment |
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$begingroup$
Note that +180° == -180°.
$endgroup$
– Jonathon Reinhart
Nov 26 '18 at 15:39