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The Designer's Guide Community Forum › Modeling › Semiconductor Devices › How to fit the knee voltage of Vbe of BJT ?

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How to fit the knee voltage of Vbe of BJT ? (Read 3602 times)

vjoshi New Member Offline Posts: 5	How to fit the knee voltage of Vbe of BJT ? Aug 05^th, 2005, 2:40pm I am now able to model and get the Ib vs Vbe curve but the knee voltage of Vbe of the measured BJT model is 2.7 V and I am getting .8 V for my pspice model. What parameters should I change to get the knee voltage of Vbe to 2.7 V ?
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vjoshi New Member Offline Posts: 5	How to fit the knee voltage of Vbe of BJT ? Reply #1 - Aug 11^th, 2005, 6:19am I am able to model the Ib vs Vbe curve of the real BJT with the pspice model of BJT. I changed the values of ISE and ISC. I wanted to know if I could reduce the slope of the curve between 0 V and 2.7 V to zero so that it matches perfectly with the real BJT Ib vs Vbe curve. Thanks
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Geoffrey_Coram Senior Fellow Offline Posts: 1999 Massachusetts, USA	Re: How to fit the knee voltage of Vbe of BJT ? Reply #2 - Aug 18^th, 2005, 10:07am You can try changing the emission coefficients or perhaps the series resistances (rb, re). 2.7V is a pretty high voltage for the knee. Most diodes have a knee of 0.5 to 0.8 V. Are you sure your measurements are right?
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