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Different methods of Vbe measurement for BJT: which one is more accurate?

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amanda_au86

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Hi guys,

I'm designing a thermo diode and want to measure Vbe value to get the non-ideality factor.
I have two ways to get Vbe in .meas statement.
First method is:
.meas tran VB find V(B) at 40n
.meas tran VE find V(E) at 40n
.meas VBE param = 'VB-VE'

Second method is
.meas tran VBE vbe(xtd1.xqq0.qin)

Both methods produce different values. Let say first method I get 0.6637V and second method I get 0.6552V. Which value is more accurate? And why they have different values?
Please advise.

Thanks.
 

This might not offer an explanation but a possible solution:

Take the average of the two values you get. Use the answer.

Humza.
 

Could it be first method includes parasitics and second method is based on spice model?
 

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