Model 8010 High Power Device Test Fixture User's Manual
Section 3: Working with devices and instruments
8010-900-01 Rev. C / March 2017
3-19
Table: Bias tee kit operating modes overview
Mode/block
diagram
Application
Control voltage
1
AC switch
state
DC switch
state
Use for best DC low current
measurement performance.
Ideal for any DC measurements
made with the 8020-CVU
installed. DC currents up to 1 A
are permissible in this mode.
Example tests: Idss, Vds-Id
0 V (default
state)
Open
Closed
Use for C-V measurements with
a maximum DC bias current of
100
µ
A. Frequency range of 10
kHz - 2 MHz possible
2
.
Example tests: Ciss, Coss
-10 V
Closed
Open
For C-V measurements with a
maximum DC bias current of 1
A. Frequency range of ~100
kHz - 2 MHz possible
3
. Not for
low current DC measurements.
Example tests: Ciss, Coss
+10 V
Closed
Closed
1 The control voltage is a DC voltage driven at the AC input of the bias tee. Each control voltage must be maintained /- 250 mV. A minimum drive
current of 15 mA is required to close any of the desired switches.
2 Dependent on test system inductance.
3 Dependent on test system inductance.
I-V mode
This is the default state for the bias tees. Use this mode for performing any DC measurements
through the CVU-3K-KIT and CVU-200-KIT bias tees. Low current DC measurements made with the
bias tee kits installed require additional settling time over those made without a bias tee kit. This
mode achieves low DC leakage current by opening the AC switch in the bias tee.
ACS Basic presets the control voltage for setting the bias mode, which means that you will not be
able to use low DC leakage mode when you're using the C-V test module.
The next figure shows the basic bias tee default mode electrical block diagram.
Figure 26: Default state low DC leakage current mode block diagram