how do I specify a different operating temperature for a specific component instead of it applying it to all?
.TEMP -32 for example is for all the components, but I would like to specify that a DIODE is at like -100 C for example, while every one else is at 38c et..
In PSpice, it's specified in the model card, and can be parameterized.
I would expect LTspice to be similar. ...Jim Thompson
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| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 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.
As I've previously opined, LTspice tends to provide overly optimistic models... as Fred pointed out, many parameters are ignored or defaulted. If I were you I'd pull models down from the web rather than using the "canned" versions. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 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.
Ok, the optional menu allowed me to enter TEMP -32 in a spice line, which resolved that problem..
I've been working on a noise problem that uses signal diodes and these diodes are subjected to cold temperatures. One diode gets a different temp than the other and I use these to form a bridge.
The signal is pulsed and after applying this TEMP parameter I can now see where the possible problem is.
It seems that the diode increases temperature at the junction that takes up 250 ms, according to spice, to level out. This changes the Vf during that time..
So I shorten the pulse down to 10 ms and I don't see this any more.
We'll have to apply this in real life to see if this helps. We are trying very hard not to use much for filtering so that we can maintain response time.
It's possible Ltspice is giving me some bogus numbers, i've always been partial to bench testing over sims.
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