AVG and RMS in LTSpice?
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Posted by Joerg on July 14, 2008, 5:54 pm
Please log in for more thread options some extra placed parts. Not this time. How can one calculate the (running) average of a trace? IOW as if there was an RC or LC lowpass. Or something where I can set a scooting window. I know you can find out the AVG by zooming the plot, then CTRL-right_click. But I'd like graphs that show me efficiency penalties over the course of simulated load changes. It doesn't spit out the raw data and I don't really want to go via Excel if possible. Also, preferably not the V-Source plus I-Source scheme of LTSpice because that's restricted to one each. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. | |||||||||||||||||||||||||
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Posted by D from BC on July 14, 2008, 6:18 pm
Please log in for more thread options Dunno if I've grasped the problem, but it reminds me of the time I was sim'ing PWM instability. It's goofy to check the length of hundreds of pulses in LTSpice. So I made a spice circuit to help me spot PWM variations as LTSpice was plotting. Fake circuits to help design real circuits. :) I just call'm helper circuits to get quick analysis. Perhaps make the electronic equivalent for the behavior you want to observe. Maybe that helps.. D from BC British Columbia Canada | |||||||||||||||||||||||||
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Posted by Joerg on July 14, 2008, 6:44 pm
Please log in for more thread options D from BC wrote:
> On Mon, 14 Jul 2008 14:54:43 -0700, Joerg
> >> Ok, guys, I don't use Spice much and usually get around this stuff via
>> some extra placed parts. Not this time. >> >> How can one calculate the (running) average of a trace? IOW as if there >> was an RC or LC lowpass. Or something where I can set a scooting window. >> >> I know you can find out the AVG by zooming the plot, then >> CTRL-right_click. But I'd like graphs that show me efficiency penalties >> over the course of simulated load changes. It doesn't spit out the raw >> data and I don't really want to go via Excel if possible. Also, >> preferably not the V-Source plus I-Source scheme of LTSpice because >> that's restricted to one each. >
> Dunno if I've grasped the problem, but it reminds me of the time I was > sim'ing PWM instability. > It's goofy to check the length of hundreds of pulses in LTSpice. > So I made a spice circuit to help me spot PWM variations as LTSpice > was plotting. > Fake circuits to help design real circuits. :) > I just call'm helper circuits to get quick analysis. > > Perhaps make the electronic equivalent for the behavior you want to > observe. > That's exactly what I've been doing for years. This time it would really clutter things though. Lots of currents to be measure and filtered. I was just wondering whether there was a reasonable math approach. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. | |||||||||||||||||||||||||
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Posted by Jonathan Kirwan on July 14, 2008, 7:10 pm
Please log in for more thread options On Mon, 14 Jul 2008 14:54:43 -0700, Joerg
>Ok, guys, I don't use Spice much and usually get around this stuff via
>some extra placed parts. Not this time. > >How can one calculate the (running) average of a trace? IOW as if there >was an RC or LC lowpass. Or something where I can set a scooting window. > >I know you can find out the AVG by zooming the plot, then >CTRL-right_click. But I'd like graphs that show me efficiency penalties >over the course of simulated load changes. It doesn't spit out the raw >data and I don't really want to go via Excel if possible. Also, >preferably not the V-Source plus I-Source scheme of LTSpice because >that's restricted to one each. I just use the mouse to highlight a desired rectangle and release. The chart expands. Then I use ctrl-right-mouse-click, I think, to get the AVG and RMS figures. Something like that... it just pops up in a small dialog box. Jon | |||||||||||||||||||||||||
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Posted by Andrew Holme on July 14, 2008, 7:21 pm
Please log in for more thread options
> Ok, guys, I don't use Spice much and usually get around this stuff via
> some extra placed parts. Not this time. > > How can one calculate the (running) average of a trace? IOW as if there > was an RC or LC lowpass. Or something where I can set a scooting window. What about an arbitrary voltage source with something like: V=idt(V(x)-absdelay(V(x),100n))/100n for a 100ns moving average? | |||||||||||||||||||||||||
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>some extra placed parts. Not this time.
>
>How can one calculate the (running) average of a trace? IOW as if there
>was an RC or LC lowpass. Or something where I can set a scooting window.
>
>I know you can find out the AVG by zooming the plot, then
>CTRL-right_click. But I'd like graphs that show me efficiency penalties
>over the course of simulated load changes. It doesn't spit out the raw
>data and I don't really want to go via Excel if possible. Also,
>preferably not the V-Source plus I-Source scheme of LTSpice because
>that's restricted to one each.