Agilent Technologies 16440A Spécifications télécharger pdf (Page 30)

3-2 Agilent 4155B/4156B Quick Start Guide, Edition 2

Analyzing the Results

In the previous chapter, you measured the drain current (Id) while performing a

synchronous sweep of the gate voltage (Vg) and drain voltage (Vd). And the

measurement results were drawn graphically on the screen.

In this chapter, you analyze the measurement results on the graph and search

threshold voltage (Vth) of the DUT.

The basic algorithm to search for the threshold voltage is:

1. Assign gate voltage (Vg) to X-axis, ÖId

to Y1-axis, and ¶ÖId / ¶Vg to Y2-axis.

2. Search for the maximum value of ¶ÖId

/ ¶Vg curve, which is also the point

where the gradient of ÖId

curve is maximum.

3. Draw a tangent line to the point where the gradient of ÖId

curve is maximum.

4. Read the X-coordinate value where the tangent line crosses the X-axis. This

value is threshold value (Vth).

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Agilent Technologies 16440A Spécifications Page 30