[SI-LIST] Re: Basic HSpice question in using AC, DC, Tran commands
- From: steve weir <weirsi@xxxxxxxxxx>
- To: ria_rr_84@xxxxxxxxx
- Date: Mon, 19 Nov 2007 19:44:28 -0800
Ria, .dc performs an analysis of steady state voltages. .ac performs an
analysis of AC amplitude and phase versus frequency. .tran runs a
transient analysis that let's you see voltage, current, and power versus
time for the nodes specified in .print statements. That is what you
need to use if you want to see waveforms. You will need to specify the
voltage waveform as a pulse or pwl and place some parasitics between the
driver and the line to see anything like what your line will do when
driven by a real IC.
Steve.
Ria R wrote:
> Hi Gurus,
> I have a very basic question about the difference in using the .ac, .dc or
> tran commands in HSpice
> Now the deck I am writing is very simple.
> I am trying to simulate and look at the response when a single ended
> microstrip is simulated.
> My circuit comproses of a voltage source (5V), the transmission line itself
> (Z0=50 ohms), and a load resistance (50 ohms)
> I am trying to look at the output when R=Z0, R=short and R=open
> Also, next I am planning to look at differential traces in place of single
> ended etc.
> Now my question is: What type of stimulus should I use? .AC, .DC or tran?
> When should I use what and what are their benefits?
>
> This is more of a learning experiment I am doing. So please send all your
> ideas to make this experiment more interesting and more informative for me.
>
> Thanks in advance,
> Regards, Ria.
>
>
>
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