curve tracer (npn)


by sandy.bridge
Tags: curve, tracer
sandy.bridge
sandy.bridge is offline
#1
Mar29-12, 02:12 PM
P: 767
Hello,
Hoping this can be cleared up quickly as I have my final exam in 1 hour. My question is for the attached image. I know for pnp transistors that ic=0, and Vce=0 at top right hand corner. However, one thing I don't understand is why the base current starts at 20uA at the bottom, rather than at the top. Help is greatly appreciated!
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iv characteristic.JPG  
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berkeman
berkeman is offline
#2
Mar29-12, 04:39 PM
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P: 39,683
Probably too late for your exam, but it looks wrong to me. 20uA should be the top (smallest Ic) trace, and Ib should step to larger values at the larger Ic values.
sandy.bridge
sandy.bridge is offline
#3
Mar30-12, 02:35 PM
P: 767
That's what I thought. Looks like whoever marked it was not paying attention.


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