[SI-LIST] Re: Frequency v/s Time Domain analysis

  • From: John Fisher <jmfisher@xxxxxxxxx>
  • To: a.ingraham@xxxxxxxx, <rmatthews@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 04 Nov 2004 14:17:59 -0800

All,
If your simulation has perfect grounds then it may not capture the resonances 
that are in the real system which has imperfect grounds with holes, 
irregularities etc.

John

 At 02:00 PM 11/4/2004 -0500, Andrew Ingraham wrote:
>> Another thing to consider is the ability to capture system resonances in
>> your
>> simulation. If you are trying to evaluate the system over a wide range of
>> frequencies
>> in order to understand where the resonances are, then I think that a
>> time-domain
>> simulator is a much better choice. Using a frequency-domain simulation
>> engine
>> is going to require that you choose your frequencies correctly. Murphy's
>> law
>> says that system resonant frequencies are going to be something other than
>> what
>> you've chosen.
>
>In this case, it's probably the other way around (if you even could simulate
>the DDS circuit in the frequency domain, that is).
>
>Frequency domain analysis lets you step through several frequencies
>relatively quickly.  While they are still discrete steps (leaving gaps),
>it's easy to do lots of them quickly.
>
>The output of a DDS is a sinusoid, so in the time domain you get to check
>only one frequency at a time ... slowly.
>
>Regards,
>Andy
>
>
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