Model 4200A-SCS Parameter Analyzer Reference Manual
Section 4: Multi-frequency capacitance-voltage unit
4200A-901-01 Rev. C / February 2017
4-87
Formulas and constants
This project uses two formulas, described in the following topics. There are no constants.
Formula: CAVG
Formula name: CAVG
Units: F
Description: Calculates the average capacitance.
Formulator entry:
CAVG = AVG(CP_AB)
Formula: STD_DEV
Formula name: STD_DEV
Units: None
Description: Calculates the standard deviation of the capacitance measurements.
Formulator entry:
STD_DEV = STDEV(CP_AB)
cv-gd and cv-sd tests
cv-gd
test: This test measures C-V (gate to drain at 1 MHz) on a nanowire device on a wafer or a
discrete nanowire device. It generates a C versus V graph.
cv-sd
test: This test measures C-V (source to drain at 100 kHz) on a nanowire device on a wafer or
a discreet nanowire device. This test generates a C versus V graph and calculates average
capacitance and standard deviation.
Both tests are configured the same except for the drive frequency.
cv-gd and cv-sd Analyze sheet
The test data is displayed in the Analyze sheet:
•
Cp_AB: Measured parallel capacitance.
•
Gp_AB: Measured conductance.
•
DCV_AB: Forced DC bias voltage.
•
F_AB: Forced test frequency.
•
CVU1S: Status code for each measurement. Rows highlighted in blue indicate a fault. For details,
see
(on page 6-191).
•
Formulas: Formulator calculation results (
cv-sd
test only).
AB = Terminal A to Terminal B.
