shanmei
Advanced Member level 1
As shown in the bellowing figure, when can set different Vgs conditions, and then sweep Vds to get Ids_Vds curves with various Vgs. Then extending those curves and crossing at Va point, then we know the value of Va, then lamda=1/Va.
In real life, the curves are not so "straight", so how can we know which location is the start point the extend the Ids_Vds curve?
For example, in the bellowing figure, we can choose node A or B or C to extend the lines, and each one will result in different Va value.
My question is how should we set the start point to extend the lines to get Va? Is this method still effective considering real cmos model is indeed much complex. If this method is not working, how can we know Va? Thanks
In real life, the curves are not so "straight", so how can we know which location is the start point the extend the Ids_Vds curve?
For example, in the bellowing figure, we can choose node A or B or C to extend the lines, and each one will result in different Va value.
My question is how should we set the start point to extend the lines to get Va? Is this method still effective considering real cmos model is indeed much complex. If this method is not working, how can we know Va? Thanks