[SI-LIST] Re: capacitor impedance in time domain
- From: "Matthias Bergmann" <matthias-bergmann@xxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 26 Jan 2005 22:13:32 +0100
Hello, I don`t understand why impedance should be limited to Frequency
domain. What impedance are we speaking about ? For example the
characteristicimpedance Z of a transmission line also exists in time domain.
If you look along a transmission line, v(t) / i(t) have got singularities
(undefined, infinite), these are called short and open ?!?!? Furthermore
mostof the simulation programs use the time domain because it permits
non-linearities. I don`t know how what happens when your impulse is
trapezoidal, but if it was a rectangular and your load is a capacitance, you
are answer would look like an exponential function, with your reflection
co-efficient as initial value. Regards, Matthias Bergmann P.S.: Yes, use
SPICE or ADS ! _m |---------+---------------------------------->
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         "Andrew
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         26.01.2005
15:53 | |        
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 Bitte antworten an | |        
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 a.ingraham         |
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An:  <si
-list@xxxxxxxxxxxxx>          
-LIST] Re: capacitor impedance in time
domain           
60I            
          |
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--  -----------------------------------------| >I could be wrong >but
tome >impedance is a concept strongly related to Frequency domain. >>It is
meaningful just in that domain. Absolutely. If you define impedance as
voltage/current, then you run into great difficulties if you try to do it in
the time domain.  In general, with any complex impedance, v(t)/i(t) has
singularities (undefined, infinite). I consider impedance = v(s)/i(s) or
v(f)/i(f), which makes it a strictly frequency domain parameter. Regards,
Andy ------------------------------------------------------------------ To
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