2 CMOS
2.27 Simple Vth : Evaluation of Threshold Voltage (Vth) (A.01.20)
[Supported Analyzer]
B1500A, 4155B, 4155C, 4156B, 4156C
[Application]
This application evaluates the threshold voltage (Vth) of a Nch MOSFET.
[Device Measured]
Single device with four terminals.
[Parameter Setting]
Test parameters are specified for NMOS device under test.
Swept bias voltage parameters are specified by the gate voltage referenced to the source voltage (Vg).
[Description of Measurement]
Gate voltage (Vg) sweeps in accordance with the test parameter setting.
Currents flowing in drain terminal are measured while the gate voltage sweeps.
[Plot Display]
Measured drain currents and transconductance in linear scale are plotted versus gate voltage on the linear
horizontal axis.
Maximum transconductance value (Gmmax) and threshold voltage (Vth) are extracted from the measurement
data, then displayed in the parameters display area.
Agilent EasyEXPERT Application Library Reference, Edition 8
2-43
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