and the time constant will depend on the C
and the parallel combination of R
Figure 2.23: Transmission line terminated in a parallel capacitive and resistive load.
Reflection from an Inductive Load.
When a series inductor appears in the electrical pathway on a transmission line, as depicted
, it will also act as a time-dependent load. Initially, at time = 0, the inductor will
resemble on open circuit. When a voltage step is applied initially, almost no current flows
across the inductor. This produces a reflection coefficient of 1. The value of the inductor will
determine how long the reflection coefficient will remain 1. If the inductor is large enough, the
signal will double in magnitude. Eventually, the inductor will discharge its energy at a rate
that depends on the time constant of an LR circuit, which will have a value of L/Z
shows the reflections from four different values of the series inductor depicted in
. Notice that the magnitude of the reflection and the decay time increased with
increasing inductor value.
Figure 2.24: Series inductor.
Figure 2.25: Reflection as seen at node A of
for different inductor values.
2.4.5. Termination Schemes to Eliminate Reflections
(2.14) and the time constant will depend on the C L and the parallel combination of R L and Z o : (2.15) Figure 2.23: Transmission line terminated in a parallel capacitive and resistive load.