32 | Keysight | B1505A Power Device Analyzer/Curve Tracer - Data Sheet
GaN current collapse measure mode
To make the GaN current collapse measurement, the HVSMU first applies high voltage stress to the DUT when the DUT is in the OFF-
state. Next the HVSMU performs voltage measurement and the HCSMU performs I-V measurement to monitor the ON-state charac-
teristics of the DUT. When making the ON-state measurement, the HVSMU is measuring voltage and both the HVSMU and HCSMU are
used to measure the total current.
HVSMU Source setting range for OFF-state
Voltage
Current
+1 V - +3000 V 1
4 mA (V > 1500 V), 8 mA (V ≤ 1500 V)
1 Setting value must be the ON state voltage plus 1 V or more.
HCSMU source setting range for ON-state
Voltage
Current
Maximum
Minimum
20 mA 3
0 V - ±40 V 2
20 A pulse (V ≤ 20V) / 1 A DC
2 Voltage actually applied to the device under test (DUT) is the setting value minus the voltage
drop of the switch.
3 Sum of HCSMU output current and HVSMU output current flow into DUT.
Minimum voltage measurement resolution for OFF-state: 200 µV
Minimum current measurement resolution for ON-state: 100 nA
Minimum transition time (OFF to ON): 20 µs
Duration setting for OFF-state: 10 ms - 655.35 s
Sampling rate: 2 µs to 12 µs for current, 6 µs for voltage
Minimum ON state duration: 50 µs
Static characteristics mode
The following information applies to measurement of the DUT ON-state static characteristics. The N1267A ensures that the DUT is in
the ON-state during these measurements. The HVSMU applies 0 V with 1 µA compliance and measures Vds or Vf. At the same time,
the HCSMU is also performing an I-V measurement. The Id or If is determined by adding together the total current measured by both
the HCSMU and the HVSMU.
HCSMU source setting for Id-Vds, Vf-If measurement
Voltage
Current
Maximum
Minimum
20 mA 4
0 V - ±40 V
20 A pulse (V ≤ 20V) / 1 A DC
Minimum voltage measurement resolution: 200 µV
Minimum current measurement resolution: 10 pA 4)
4 Offset error for the Id-Vds, If-Vf measurement is typical 1 µA
The following information applies to measurement of the DUT OFF-state static characteristics. The N1267A ensures that the DUT is
in the OFF-state during these measurements. The HCSMU applies 0 V. At the same time, the HVSMU performs I-V measurement and
measures Vds or Vr. The Id(Off) or Ir is determined by adding together the total current measured by both the HCSMU and the HVSMU.
HVSMU source setting for Id(off)-Vds, Vr-Ir measurement
Voltage
Current
Maximum
Minimum
10 µA 5
0 V - +3000 V
4 mA (V > 1500 V), 8 mA
(V ≤ 1500 V)
Minimum voltage measurement resolution: 200 µV
Minimum current measurement resolution: 10 pA 5)
5 Leak error for the Idss, Ir-Vr measurement is typical 2 nA.
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