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free spice simulator
Topic last updated 26 Sep 2010, by 
Steve Ravet.
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Steve Ravet.
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I happened to find a free spice simulator at Linear Technology. It has no net limitations, has a built in schematic editor, and a very large library of components. If you're curious you can see below a screenshot of a filter circuit I created for an ADC input, and its frequency response.
In the circuit, Rext and Cext and my external filtering components, the rest of the circuit is the internal ADC input circuitry, taken from the LPC1768 datasheet.
It's down 3db at 1.5 kHz, about what I'm looking for.
Thought others might be interested.
cheers,
--steve