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Author Topic: Strange DC results with Orcad V 17.2  (Read 366 times)
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PM3295
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« on: July 31, 2017, 06:37:05 18:37 »

I found something strange with the DC simulation results using V 17.2
It may be a bug; I don't know. If I simulate the same circuit with V 16, the Ic of Q1 goes up with temperature, while in V 17.2 it decreases as shown.
If I use another simulator like TINA-TI, the Ic also increases with temperature, similar to V 16.

I would expect Ic to increase with temperature. Any ideas?
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optikon
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« Reply #1 on: July 31, 2017, 11:01:35 23:01 »

I found something strange with the DC simulation results using V 17.2
It may be a bug; I don't know. If I simulate the same circuit with V 16, the Ic of Q1 goes up with temperature, while in V 17.2 it decreases as shown.
If I use another simulator like TINA-TI, the Ic also increases with temperature, similar to V 16.

I would expect Ic to increase with temperature. Any ideas?

Different models are being used between v16 and v17? one of them might be using a model that doesnt have all the parameters populated (defaults=zero etc..)

Can you verify that the same model is used for 2N3904 ?
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PM3295
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« Reply #2 on: July 31, 2017, 11:48:45 23:48 »

I don't have access to V 16 at the moment.  I did look at the V 17 model, and almost all the parameter fields have a non-zero entry. Creation date 2001

I decided to try with another common NPN transistor (2N4401) and got the same reverse trend for Ic. So it may not be a model problem.
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