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  #1  
Old 04-19-2012, 07:54 PM
Michael1989 Michael1989 is offline
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Default Design homework need help BJT Please Help

So i have been given an assignment to build, simulate and figure out the temperature performance of my circuit for our size model.
(different than that used in the book).
The kicker is i do not have a BJT to use since our student version does not have one. I have tried countless ways of representing a BJT but none have given me a level off graph similar to the one i need.


Attached:
1. Original circuit in book
2. Graph from book
3. My attempt at making it with out a BJT configuration.
4. 2 attempts i have made out of 10 tries
(note i allow played with these two the most with different R values)
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File Type: png imageor.png (40.4 KB, 14 views)
File Type: png graph.png (13.9 KB, 6 views)
File Type: jpg imagemine.jpg (66.8 KB, 7 views)
File Type: jpg attempts.jpg (53.6 KB, 6 views)
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Old 04-19-2012, 09:08 PM
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panic mode panic mode is offline
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you don't need BJTs, those three are wired (and labelled!) as diodes
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Old 04-19-2012, 09:55 PM
Michael1989 Michael1989 is offline
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Quote:
Originally Posted by panic mode View Post
you don't need BJTs, those three are wired (and labelled!) as diodes
Forgot to correct myself. The program does not have diodes either. We have basic logic gates, resistors, capacitors and N transistors and P transistors.
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Old 04-20-2012, 04:38 AM
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crutschow crutschow is offline
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Don't know how you can simulate a BJT if you don't even have a model.
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Old 04-20-2012, 05:01 PM
WBahn WBahn is offline
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I'd recommend going to your instructor and asking how you are supposed to model a circuit that uses devices that your simulator doesn't support. It could be that they have models and you didn't get them for some reason. It could be that you are supposed to use the simulators installed on the department's computers that have a full license. Check.
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