Hello,
I can't figure out how to plot a voltage versus a step parameter. I defined:
.step param R 100 150
but now I don't know what's the right simulation directive. I tried the tran command, and it actually plots several curves for each step. They are super-imposed of course. Instead the goal is to put my {R} variable into the horizontal axis - changing the plotted quantity field leads to error (undefined symbol).
I searched in the help without find anything useful. Thanks in advance Marco
In PSpice, it would be done in a .DC analysis. I think it's the same in LTspice. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Il 23/01/2013 15:52, Jim Thompson ha scritto:
If I understand correctly the guide the .dc directive requires either a voltage or current source to sweep.
Marco
Hi Marco,
In PSpice it would be like this...
.DC PARAM R
I couldn't find an equivalent in the LTspice manual.
Though it wouldn't surprise me if it didn't work. Mike included in LTspice many of the features of PSpice.
I'm a member of the LTspice forum, so I'll post your question, or you can join in...
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Hi Marco, I posted your question to the LTspice List...
and got this answer...
"Hello Jim,
Please use this syntax below without .DC .
.step param R 35 100 1 .op
If R is the value of a resistor, use {R} for its value.
Best regards, Helmut"
I haven't tried it, but I don't think its the same effect. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Il 23/01/2013 18:23, Jim Thompson ha scritto:
Thank you very much Jim. Tomorrow I will try the solution proposed - anyway I'm afraid it's not what I'm looking for.
I'll join the list too.
Marco
Yes. I know you're looking for a "continuous" plot of behavior versus the resistance.
Great! You'll like it. Technical discussion without bizarre claims of "I want it to work this way, don't bother me with the facts" >:-} ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Marco, You're in luck.
Just as I suspected, Mike Engelhardt Declare parameter...
.PARAM R=1K
Then Spice "Directive"...
.DC LIN PARAM R 1K 2K 100 ; For Example
I tested it simply by doing it in PSpice, then running the .CIR file in LTspice... worked great! ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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