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how to calculate the impedance

Posted 2011年3月9日 GMT-5 13:30 Low-Frequency Electromagnetics, Results & Visualization, Studies & Solvers Version 3.5a 3 Replies

Rekha Thomas
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I have modeled a semiconductor resistance to which i have applied a small signal voltage varying from 0 volts to 26 mV. by using the option of sub domain integration , i integrated the total normal current density to evaluate the small signal current. Now i would like to calculate the impedance. How can i achieve this?
3 Replies Last Post 2011年3月10日 GMT-5 00:55
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年3月9日 GMT-5 13:55
Hi

if you have the voltage, and you integrate the current over the wire section you sould get te impedance by the ratio of V/I, but take care if you have complex values to get the right formula

--
Good luck
Ivar
Hi if you have the voltage, and you integrate the current over the wire section you sould get te impedance by the ratio of V/I, but take care if you have complex values to get the right formula -- Good luck Ivar
Rekha Thomas
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Posted: 1 decade ago 2011年3月9日 GMT-5 22:31
I see that when i increase the frequency , the current is constantly increasing i.e. the impedance is constantly reducing which implies that there must be a capacitive component in the impedance. so i expect a phase lead in the current w.r.t to the voltage. is there a way by which i can see the current values? or plot the phase of the current ?
I see that when i increase the frequency , the current is constantly increasing i.e. the impedance is constantly reducing which implies that there must be a capacitive component in the impedance. so i expect a phase lead in the current w.r.t to the voltage. is there a way by which i can see the current values? or plot the phase of the current ?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年3月10日 GMT-5 00:55
Hi

3.5 is getting old in my mind, you might need to turn on the "might produce complex values" in the solver section

--
Good luck
Ivar
Hi 3.5 is getting old in my mind, you might need to turn on the "might produce complex values" in the solver section -- Good luck Ivar

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