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AC voltage with variable frequency

Posted 2 nov 2020, 22:55 GMT-5 Electromagnetics, Low-Frequency Electromagnetics Version 5.4 2 Replies

Manoj Samal
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Dear All I want to apply an AC voltage with a wide frequency range(from 0 to 1MHz) to a terminal to measure the current corresponding to each frequency change(like Sin 2pi0 to 2pi1000000). For this, I have defined a sine waveform under the definitions and used parametric sweep to define the range of frequency.

Is this the correct procedure?

2 Replies Last Post 3 nov 2020, 10:37 GMT-5
Robert Koslover Certified Consultant
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Posted: 4 years ago 3 nov 2020, 09:55 GMT-5

Maybe. If you are already using a frequency domain application, there is no need to literally specify expressions like . The fact that you mention such expressions at all may be a clue that you may be confused about something here. Perhaps you should post your model to the forum, if you have a particular question about a particular setting in it?

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
*Maybe*. If you are already using a frequency domain application, there is no need to *literally* specify expressions like sin 2pi0. The fact that you mention such expressions at all may be a clue that you may be confused about something here. Perhaps you should post your model to the forum, if you have a particular question about a particular setting in it?
Dave Greve Certified Consultant
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Posted: 4 years ago 3 nov 2020, 10:37 GMT-5

Almost all problems seeking the system response to a sinusoid should be solved using Frequency Dependent analysis.

Two EXCEPTIONS I can think of are:

  1. The sinusoid is turned on at some time and the transient evolution of the response is desired.
  2. The system is nonlinear.

Anyone using the Frequency Dependent analysis should become familar with phasors as voltages, currents, displacements, fields, etc. are phasor quantities with a magnitude and a phase.

It should be noted that Time Dependent simulations are more troublesome because they eventually stop converging and a careful choice of solver and solver settings is required. Frequency Dependent simulations rarely have convergence problems.

Almost all problems seeking the system response to a sinusoid should be solved using Frequency Dependent analysis. Two EXCEPTIONS I can think of are: 1. The sinusoid is turned on at some time and the transient evolution of the response is desired. 2. The system is nonlinear. Anyone using the Frequency Dependent analysis should become familar with phasors as voltages, currents, displacements, fields, etc. are phasor quantities with a magnitude and a phase. It should be noted that Time Dependent simulations are more troublesome because they eventually stop converging and a careful choice of solver and solver settings is required. Frequency Dependent simulations rarely have convergence problems.

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