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Old 10th July 2012, 02:51 AM   #1
BRSHiFi is offline BRSHiFi  United States
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Default BJT Spice Curve Tracer

Hello,

In spice, what do you need to do to plot the characteristic curves of a BJT? I am using Tina by TI right now and have the attached circuit set up.

What I am attempting to do is sweep the current source on the base and plot the Vce vs. the collector current.

Thanks,
kingneb
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Old 10th July 2012, 06:56 AM   #2
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There are a lot of post-processing options in the paid-for version of TINA to allow various graphs to be drawn of one output versus another. I don't know if they are available in the free version. Have you downloaded the full TINA manuals from the Designsoft website?
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Old 10th July 2012, 07:04 AM   #3
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I see there is some post processing allowed. Look in the 'EDIT' menu after you have done the dc sweep. You can do an X-Y plot of two signals. You would simply do an X-Y plot of Vcc versus Ic.

(reading the full manual is still a good idea though...)
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Old 10th July 2012, 01:57 PM   #4
BRSHiFi is offline BRSHiFi  United States
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OK, what commands plot voltage vs current? I tried V(Vce) and I(Ic) and it gave me an error.
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Old 10th July 2012, 02:51 PM   #5
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You need to use the 'dc transfer analysis' with 'parameter stepping' of the base current. A single dc transfer curve would show Ic versus Vce for a particular value of Ib.
You don't need the VF1 probe as VF1=VS3.

The context-sensitive help file covers this but can me a bit difficult to find your way around. Open the 'ANALYSIS / MODE' menu to activate parameter stepping. Select 'PARAMETER STEPPING' then click on the HELP button.

The attached pic shows a lower-voltage NPN: Ic versus Vce for 5 values of Ib.
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Old 10th July 2012, 02:59 PM   #6
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BTW, you have your current source the wrong way round!
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Old 10th July 2012, 03:50 PM   #7
BRSHiFi is offline BRSHiFi  United States
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She is working now.

Thanks.
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