Module 7
Measurement Functions
7-27
z Plot square root of the drain current (SQRT Id)
z Plot rate of change of SQRT Id (PEAK)
z Find Peak Value of the PEAK plot
z Drop down to the SQRT Id plot
z Draw a tangent line on the SQRT Id plot
z Read the X-intercept of the tangent line as Vth22
Vth Measurement
A Tedious Process Now Automated
In the previous example of graphically determining Vth, the above steps were automated. There are
other definitions of Vth which are less complex, but now you don't have to worry about complexity.
The B1500A can perform the process without you having to interact with the screen.
Not only automation removes human error, but also it allows computer controlled analysis to proceed
without interruption.
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