Agilent Technologies 93000 SOC Series Training Manual page 142

Defining the Levels
142
The C- and P- channel board clamps are integrated into the driver. The
clamps are active when the driver is in tristate mode. If the driver is
active the clamps are de-activated.
As shown in
will limit the effect of the clamps.
The Ce- channel board clamps, on the other hand, are connected on the
lines to the DUT. The clamps are active the whole time and smooth the
signals on the line (see
Drive Levels
For input and input/output pins, the level setup defines the low (vil)
and high (vih) voltage levels of input signals.
DUT
Figure 76 Drive Levels
Driver Termination
The output signals of the device's o or io pins are conducted via a trans-
mission line to the comparator in the tester. Reflections on the trans-
mission line distort the signal at the receiver side of the tester.
To avoid reflections, the transmission line (50
Ω
with 50 . As the driver has an internal resistance of R
this termination requirement is fulfilled. Since the transmission line is
terminated correctly you will not have any reflections at the tester side.
Agilent 93000 SOC Series User Training Part 1, October 2004
Figure 74 on page 140 the resistor at the driver output
Figure 75).
Drive
Levels
8-1 AC Levels
vih
High Level
vil
Low Level
Ω
) has to be terminated
Ω,
= 50
Term