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Re: QUCS - anyone using it/

Subject: Re: QUCS - anyone using it/
From: "Greg Neill"
Date: Thu, 16 Mar 2006 12:08:45 -0500
Newsgroups: sci.electronics.basics
"Seeker" <nospam@xxxxxxxxxxxx> wrote in message 
news:pan.2006.03.16.15.12.09.876982@xxxxxxxxxxxxxxx
> On Thu, 16 Mar 2006 14:07:16 +0000, Anthony Fremont wrote:
>
> > First click on this link:
> > http://www.linear.com/index.jsp
> >
> > Click on the "Free SwitcherCAD Download" button.
>
> I tried that, but its simulator seems a bit off:
>
> http://img512.imageshack.us/img512/7008/screenshotlineartechnologyltsp.png
>

The time constant for your circuit is 10nS, so all the
interesting stuff will happen in the first 50nS or so.

Go to the Simulate menu and select Edit Simulation Command.
Set:

  Stop Time                  100ns
  Time to Start Saving Data    0ns
  Maximum Timestep             1ns

Next, left-click on the voltage supply and choose the PWL
function.  This will allow you to simulate turning on the
power at a specified time.  Set:

  time1[s]:  0
  value1[V): 0
  time2[s]:  1ns
  value2[V]: 1V

Try that and see what happens.



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