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It seems obvious to me that the results are the same. I think that in order to achove what you have in mind Ra should be {Rx} and Rb should be {500-Rx} You need only one .step and you do not need

I tried .step param r1 490 10 -10 and R2 set to {500 - {r1}} output seems to be all-right... cheers AG

Thanks A. Ganesan

Both Octave and Scilab are freeware. Howard

Hello, I'd like to simulate a 500 ohm pot by using a voltage divider: (View using a fixed-pitch font) CW | [Ra] | +---COM | [Rb] | CCW and stepping Ra from 499 ohms to 1 ohm in one ohm steps while

Hi all, I've started playing around with the awesome TIA model (TIA_universalopamp_shotnoise.asc) and have a couple of questions or perhaps statements that I'd like verified so I can understand I'm

Thanks.. I model offset by dial ling some mismatch, so it includes temperature effects.. I can understand Microchip having poor models.. But TI, LTC and ADI have way too complex models for the job

I'm not sure I understand How do you model offset? I model it by adding a DC source in series with the In+ or IN- gate. some value between 100uV and 10mV depending on the expected mismatch of the

Hello AG, Maybe this will work. Let's assume you have the non modified divider on the schematic too. .step param TOL 0 0.01 0.1 .param RX=1k*(1+TOL) V1 100 0 {TOL} Then plot the following.

Thanks.. What freeware will meet my needs..? (I am a windows XP guy) cheers AG

LTspice doesn't have any built in capability for merging data. However, you can export the data and then use a program like Octave, Scilab or Matlab to merge the data. The data would be represented as

Tony, You wrote, "I believe it is more efficient to use the parasitics included in LTspice inductors and capacitors than to have explicit discrete parasitic components, even though you lose the

Thanks for the suggestions.. I will get back in a few days.. My more complicated models which I did not post are Gm and R based.. However my most complicated model seems to be much simpler than what

Thanks..will get back in a few days.. Cheers AG On 9/14/2011 3:28 AM, RobertTalty wrote:I am re posting this since I didn't get aye or nay... Cheers AG

Hello S, The reason LTspice doesn't recognise your NAND gate is because it isn't a native model. This model is from another flavour of SPICE, and won't work at all. LTspice does not support logic

Hi Tony, I think you are right. I fear so. Thanks for the confirmation. Axel

AG, I don't know how to do this sort of thing within LTspice However, the proprietary binary output of LTspice is SpiceExplorer compatible, so I use SpiceExplorer as the waveform viewer for anything

Hi AG, I forgot to mention that there is an A-device OTA (single ended unfortunately) look LTspice\lib\sub folder at the UniversalOpamps2.sub file it is a text netlist file, with an example of