Keithley 4200-SCS User Manual page 160

Section 3: Common Device Characterization Tests
Table 3-10
Inputs for VdId_Pulse_DC_Family_pulseiv
Input
VgStart
VgStop
VgNumSteps
Vg_off
VdStart
VdStop
VdStep
PulseWidth
PulsePeriod
AverageNum
GateScpRange
DrainScpRange
3-54
Set the appropriate values for the Vds-Id parameters. Inputs, outputs and returned
values are provided in Table
Type Description
double The starting step value for Vg. For DC only sweeps, VgStart must be
between -200 V to +200 V dependent on the type of SMU and the
current requirements of the DUT. For pulse and pulse and DC
Sweeps, VgStart must be between -5 V to +5 V.
double The final step value for Vg. For DC only sweeps, VgStop must be
between -200 V to +200 V dependent on the type of SMU and the
current requirements of the DUT. For pulse and pulse and DC
Sweeps, VgStop must be between -5 V to +5 V.
double The number of steps for Vg (Max = 10).
double The DC bias applied by the GateSMU to put device in the OFF
state. Set to 0 V for enhancement FETs (may be non-zero for
depletion FETs).
double The starting sweep value for Vd. For DC only sweeps, VdStart must
be between -200 V to +200 V dependent on the type of SMU and
the current requirements of the DUT.
double The final sweep value for Vd. For DC only sweeps, VdStop must be
between -200 V to +200 V dependent on the type of SMU and the
current requirements of the DUT.
double The number of steps for the Vd sweep (Max = 10000).
double The Vgs pulse width (PW). The PW can be 40 ns to 250 ns (10 ns
resolution). Pulses wider than 250 ns will begin to be attenuated by
the coupling capacitor in the Remote Bias Tee (4205-RBT).
double The pulse period for the Vgs pulse. The period can be set from
100µs to 1 s (10 ns resolution). The period must be set so that the
Duty Cycle (DC) is no more than 0.1%. The period is most easily
calculated by multiplying the largest desired pulse width (PW)
by1000. Example: PW = 150 ns, so Period = 150µs.
int The number of pulses to average at each step of the sweep. For
best low signal performance, set AverageNum = 0 for Adaptive
Filtering.
double The voltage measure range for the scope channel measuring the
Gate. Use 0 for scope autoranging, or specify a voltage value for a
fixed range. Valid voltages are 0.050, 0.1, 0.2, 0.5, 1, 2, 5, 10.
These ranges are Vpp. For example, the 0.5 range covers -250 to
+250 mV.
double The voltage measure range for the scope channel measuring the
Drain. Use 0 for scope autoranging, or specify a voltage value for a
fixed range, where V = I * 50
0.5, 1, 2, 5, 10. These ranges are Vpp. For example, the 0.5 range
covers -250 to +250 mV.
Return to Section Topics
3-10, Table 3-11 and Table
Ω
. Valid voltages are 0.050, 0.1, 0.2,
Model 4200-SCS User's Manual
3-12.
4200-900-01 Rev. K / February 2017