Keithley 4200-SCS, User Manual, Page: 163 / 335

4200-900-01 Rev. K / February 2017 Return to Section Topics 3-57
Model 4200-SCS User’s Manual Section 3: Common Device Characterization Tests
vgsid_pulseiv
Description The vgsid_pulse sweep is used to perform a pulsed Vg-Ig sweep using the 4200-
PIV package. This test is similar to a typical DC Vg-Id but only two sources are
used: gate (VPUID pulse channel 1) and drain (DrainSMU). The gate is pulsed,
but the drain is DC biased.
Measurements are made with the 2 channel scope card. Set the appropriate values
for the Vgs-Id parameters (
Table 3-13 ). Table 3-14 and Table 3-15 contain outputs
and return values, respectively.
Connection The source and body (well) of the DUT must be shorted together and connected to
the common low (outer shield) of the SMA cables on the AC+DC output of the
4200-RBT. The RBT connected to GateSMU (with the Power Divider) should be
connected to the gate. The RBT connected to DrainSMU should be connected to
the drain. For detailed connection information, refer to the
PIV-A interconnect
assembly procedure on page 3-35 .
-11 Invalid VPUId
-12 Invalid GateSMU
-13 Invalid DrainSMU
-14 Unable to initialize PIV solution
-15 Invalid GateSMU Range
-16 Invalid DrainSMU Range
Table 3-13
Inputs for vgsid_pulseiv
Input Type Description
Vds double The drain-source voltage, output by the DrainSMU (defined below).
Vg_off double The DC bias applied by the GateSMU to put device in the OFF
state. Normally set to 0 V for enhancement FETs (may be non-zero for
depletion FETs).
VgStart double The starting sweep value for Vg, output by channel 1 of the pulse
generator card (VPUID).
VgStop double The final sweep value for Vg, output by channel 1 of the pulse
generator card (VPUID).
VgStep double The sweep step size for the Vg sweep, output by channel 1 of the pulse
generator card (VPUID).
PulseWidth double The Vgs pulse width (PW). The PW can be 40 ns to 150 ns (10 ns
resolution). Pulses wider than 150 ns will begin to be attenuated by the
capacitor in the 4200-RBT.
PulsePeriod 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 = 150 us.
AverageNum int The number of pulses to average at each step of the sweep. For best
low signal performance, set AverageNum = 0 for Adaptive Filtering.
Table 3-12
Return values for Vdid_Pulse_DC_Family_pulseiv (continued)
Value Description