3.6 The Smith Chart
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3.7 Video Tutorials
The reader may now wish to watch some illustrative videos which give further insight into the topics
explained so far in this chapter. A brief description of the content of these video tutorials is
provided below.
VIDEO
REFERENCE
CONTENT
3.1
This video demonstrates how to set up simulations to measure and display the
reflection coefficient for a simple circuit of the type shown below.
The reflection coefficient for matched (
) and mismatched terminations
(
) and its variation with the electrical length of the line are shown. The
relationship
between the polar plot of the reflection coefficient and the
impedance Smith chart is also illustrated (Figure 3.6-1, Figure 3.6-2)
3.2
This tutorial revisits reflection coefficient measurements for matched (
)
and mismatched terminations ( and ). It also illustrates the
concept of standing waves and how to measure the Voltage Standing Wave Ratio
(VSWR)
3.3
This tutorial illustrates the basic principles of operation of a slotted line and how
to set up a simulation that may emulate it. It also shows
the voltage and
impedance profiles along the length of the line in both a matched and
mismatched case.
3.4
Time domain reflectometry – part 2. This video tutorial shows how to use the
respective simulation file (TDR_video_2_1_and_3_4.emp) to replicate
a time
domain reflectometer. Pulse propagation and reflection in the case of a line
mismatched with finite load impedances which are lower (
) or greater
(
) than the characteristic impedance of the line, are shown.
It is recommended that the readers should try to set up similar simulations to those illustrated in the
video tutorials and explore this type of circuits. This will help them gain further insight and perhaps
find the answers to any doubts or questions that they may have.
l ,θ
(l)
Conquer Radio Frequency
145 www.cadence.com/go/awr
