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LTSpice Zener diode bug?
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I'm trying to design a circuit using a zener diode but am having issues getting it to work right.
This circuit works fine and show Vout = 6.198V. However, if I swap their positions -
Here, Vout = 200.364V. Why is this happening? Why does the anode of the zener diode need to be referenced to ground? I expected it to be 200-6.2 = 193.8V
diodes ltspice zener debugging
asked 10 hours ago
c10yasc10yas
1827 bronze badges
$endgroup$
add a comment
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$begingroup$
I'm trying to design a circuit using a zener diode but am having issues getting it to work right.
This circuit works fine and show Vout = 6.198V. However, if I swap their positions -
Here, Vout = 200.364V. Why is this happening? Why does the anode of the zener diode need to be referenced to ground? I expected it to be 200-6.2 = 193.8V
diodes ltspice zener debugging
asked 10 hours ago
c10yasc10yas
1827 bronze badges
$endgroup$
$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago
add a comment
|
$begingroup$
I'm trying to design a circuit using a zener diode but am having issues getting it to work right.
This circuit works fine and show Vout = 6.198V. However, if I swap their positions -
Here, Vout = 200.364V. Why is this happening? Why does the anode of the zener diode need to be referenced to ground? I expected it to be 200-6.2 = 193.8V
diodes ltspice zener debugging
asked 10 hours ago
c10yasc10yas
1827 bronze badges
$endgroup$
I'm trying to design a circuit using a zener diode but am having issues getting it to work right.
This circuit works fine and show Vout = 6.198V. However, if I swap their positions -
Here, Vout = 200.364V. Why is this happening? Why does the anode of the zener diode need to be referenced to ground? I expected it to be 200-6.2 = 193.8V
diodes ltspice zener debugging
diodes ltspice zener debugging
asked 10 hours ago
c10yasc10yas
1827 bronze badges
asked 10 hours ago
c10yasc10yas
1827 bronze badges
edited 9 hours ago
c10yas
asked 10 hours ago
c10yasc10yas
1827 bronze badges
asked 10 hours ago
c10yasc10yas
1827 bronze badges
asked 10 hours ago
c10yasc10yas
1827 bronze badges
1827 bronze badges
$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago
add a comment
|
$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago
$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago
$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago
add a comment
|
1 Answer
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active
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$begingroup$
From the LTspice documentation on .op:
There is no guarantee that the operating point of a general nonlinear
circuit can be found with successive linear approximations as is done
in Newton-Raphson iteration.
This circuit is non-linear and LTspice fails to detect by itself that Newton iteration fails. Disabling Newton iteration by .options NoOpIter forces LTspice to try different methods for operating point calculations. In this case it opts for Gmin stepping instead and finds the correct result:
Gmin stepping succeeded in finding the operating point.
Semiconductor Device Operating Points:
--- Diodes ---
Name: d1
Model: bzx84b6v2l
Id: -9.69e-04
Vd: -6.18e+00
Req: 1.36e+01
CAP: 4.80e-09
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
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1 Answer
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1 Answer
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active
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$begingroup$
From the LTspice documentation on .op:
There is no guarantee that the operating point of a general nonlinear
circuit can be found with successive linear approximations as is done
in Newton-Raphson iteration.
This circuit is non-linear and LTspice fails to detect by itself that Newton iteration fails. Disabling Newton iteration by .options NoOpIter forces LTspice to try different methods for operating point calculations. In this case it opts for Gmin stepping instead and finds the correct result:
Gmin stepping succeeded in finding the operating point.
Semiconductor Device Operating Points:
--- Diodes ---
Name: d1
Model: bzx84b6v2l
Id: -9.69e-04
Vd: -6.18e+00
Req: 1.36e+01
CAP: 4.80e-09
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
$endgroup$
add a comment
|
$begingroup$
From the LTspice documentation on .op:
There is no guarantee that the operating point of a general nonlinear
circuit can be found with successive linear approximations as is done
in Newton-Raphson iteration.
This circuit is non-linear and LTspice fails to detect by itself that Newton iteration fails. Disabling Newton iteration by .options NoOpIter forces LTspice to try different methods for operating point calculations. In this case it opts for Gmin stepping instead and finds the correct result:
Gmin stepping succeeded in finding the operating point.
Semiconductor Device Operating Points:
--- Diodes ---
Name: d1
Model: bzx84b6v2l
Id: -9.69e-04
Vd: -6.18e+00
Req: 1.36e+01
CAP: 4.80e-09
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
$endgroup$
add a comment
|
$begingroup$
From the LTspice documentation on .op:
There is no guarantee that the operating point of a general nonlinear
circuit can be found with successive linear approximations as is done
in Newton-Raphson iteration.
This circuit is non-linear and LTspice fails to detect by itself that Newton iteration fails. Disabling Newton iteration by .options NoOpIter forces LTspice to try different methods for operating point calculations. In this case it opts for Gmin stepping instead and finds the correct result:
Gmin stepping succeeded in finding the operating point.
Semiconductor Device Operating Points:
--- Diodes ---
Name: d1
Model: bzx84b6v2l
Id: -9.69e-04
Vd: -6.18e+00
Req: 1.36e+01
CAP: 4.80e-09
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
$endgroup$
From the LTspice documentation on .op:
There is no guarantee that the operating point of a general nonlinear
circuit can be found with successive linear approximations as is done
in Newton-Raphson iteration.
This circuit is non-linear and LTspice fails to detect by itself that Newton iteration fails. Disabling Newton iteration by .options NoOpIter forces LTspice to try different methods for operating point calculations. In this case it opts for Gmin stepping instead and finds the correct result:
Gmin stepping succeeded in finding the operating point.
Semiconductor Device Operating Points:
--- Diodes ---
Name: d1
Model: bzx84b6v2l
Id: -9.69e-04
Vd: -6.18e+00
Req: 1.36e+01
CAP: 4.80e-09
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
answered 9 hours ago
realtimerealtime
6805 silver badges15 bronze badges
6805 silver badges15 bronze badges
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$begingroup$
If you do a .TRAN analysis you will get the value you expect. The operating point calculation assumes, I think, that the diode is forward biased as an initial assumption. That's a starting point for the analysis. But it's not the end-point.
$endgroup$
– jonk
9 hours ago