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Agilent 4155C/4156C VXIplug&play Driver User’s Guide, Edition 1 4-5

Sample Application Programs for Agilent VEE

Introduction

Definition of Vth

The threshold voltage (Vth) is extracted by a linear interpolation using two

measurement points, which are the nearest from the targeted point for both higher

and lower directions. The targeted point (Vg_extract,Id_target) is an ideal point,

which indicates the Id_target value on the line through the two measurement points

on the Id-Vg curve. See Figure 4-1.

Figure 4-1 Definition of Vth

If Id(n)=Id_target, Vth=Vg(n)

If Id(n)<>Id_target, Vth=Vg_extract

(Vg(n+1),Id(n+1))

(Vg(n),Id(n))

(Vg_extract,Id_target)

Definition of Vth

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Agilent Technologies Agilent E5250A Guida Utente Pagina 145