VNA0440
–
VNA0440e
VNA0460
–
VNA0460e
user manual V3.1
- 34 -
Bias
The VNA04x0-e version comes with an internal programmable bias generator. This is a
regulated
power
supply
where
you
can
set
limits
to
voltage
(-12...+12V
) and current (
+/- 1...100 mA
), just as with most regulated laboratory power
supplies, where it serves as a current- of voltage source. The levels are specified at the
input of the bias-Tee's.
The current or voltage can also be swept when it is configured so in the
Sweep Manager
.
In the above example both Bias Voltage and Bias Current are fixed values.
The right side of the panel defines the Bias configuration of each of the VNA ports:
•
Open: The port has a default ground resistance of 100kOhm.
•
Gnd: The port has a low ground resistance of about 20Ohm, to provide a ground path
for bias currents through the DUT.
•
Bias: The port is connected to the bias generator with its voltage and current settings.
Warning: The maximum power dissipation of the port ground resister is 0.2 Watt so
the user must make sure that a current into this resistor does not exceed 100mA and
the voltage does not exceed 2V.
Calibration
This panel controls the calibration settings of the measurement and allows the user to step
through the calibration procedure. This procedure is explained in detail elsewhere in this
manual.
