Agilent Technologies EasyEXPERT, Manual, Page: 116 / 610

2 CMOS
IsubsLimit: Substrate current compliance
HoldTime: Hold time
DelayTime: Delay time
Vth_Min: Minimum Vth value for graph scale
Vth_Max: Maximum Vth value for graph scale
gmMax_Min: Minimum gmMax value for graph scale
gmMax_Max: Maximum gmMax value for graph scale
DrainMinRng: Minimum range for drain current measurement
[Measurement Parameters]
Idrain: Drain current
[User Function]
gm=diff(Idrain,Vgate)
[Analysis Function]
gmMax=max(gm)
Von=@L1X (X intercept of Line1)
Vth=Von-Vd/2
Vth is given by the following formula.
Vth=Vg(gmMax)-Id(gmMax)/gmMax
Vd/2 is for compensation of the secondary term of Vd in the theoretical formula.
[Auto Analysis]
Line1: Tangent line for Y1 at gm=gmMax
[X-Y Plot]
X axis: Gate voltage Vgate (LINEAR)
Y1 axis: Drain current Idrain (LINEAR)
Y2 axis: Transconductance gm (LINEAR)
Y3 axis: Drain current Idrain (LOG)
[List Display]
Gate voltage Vgate
Source voltage Vsource
Drain voltage Vdrain
Substrate voltage Vsubs
Drain current Idrain
Transconductance gm
[Parameters Display Area]
Threshold voltage Vth
Maximum transconductance value gmMax
[Test Output: X-Y Graph]
X axis: Gate length LgList (LINEAR)
Y1 axis: Threshold voltage VthList (LINEAR)
Y2 axis: Maximum transconductance value gmMaxList (LINEAR)
[Test Output: List Display]
Gate length LgList
Threshold voltage VthList
Maximum transconductance value gmMaxList
Agilent EasyEXPERT Application Library Reference, Edition 8
2-54