Tektronix, Inc.
14200
SW Karl Braun Drive
P.O. Box 500
Beaverton,
OR 97077
USA
For
product information, sales, service, and
technical
support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find
con
tacts in your area.
IConnect
®
TDR Software Modeling Quick Guide
TDRPST-0201
Data subject to
change
without notice
V
½ V
0
Matched Load
Z
Load=Z0
Z
0
Z
0
Z
Load
≠≠
Z
0
½ V
0
Z
Load
=0
Z
Load
=
∞∞
Mismatched load
(( ))
0load
load
ZZ
Z
V
++
⋅⋅
Z
load
> Z
0
Z
load
< Z
0
Z
0
Z
0
Short circuit Termination
Open circuit Termination
½ V
0
½ V
0
0
0
ZZ
ZZ
V
V
load
load
incident
reflected
++
−−
====
ρρ
settledincident
sett
led
load
VV
VZ
ZZ
−−⋅⋅
⋅⋅
==
−−
++
⋅⋅==
21
1
0
0
ρρ
ρρ
Z
Load
Z
0
R
source
l
en
aP
tnorF
ep
oc
s
oll
i
csO
RDT
R
source
= 50
ΩΩ
Z0 = 50
ΩΩ
then V
incident
= ½V
V
incident
0
V
settled
=
V
incident+Vreflected
V
incident
V
reflected
Basic TDR Osciloscope Equivalent Circuit
Bas
ic TDR Equations
V
Copyright © Tektronix, Inc. All Rights Reserved.
L-C discontinuity
C-L discontinuity
L-C-L discontinuity
C-L-C discontinuity
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Shunt C discontinuity
Series L discontinuity
Z
0
Z
0
Z
0
Z
0
Inductive termination
V
Capacitive termination
Z
0
Z
0
½ V
0
½ V
0
½ V
0
½ V
0
½ V
0
½ V
0
½ V
0
½ V
0
Measure
Model
Simula
te
Compare
and Verify
TDR
Source
Interconnect
model
001-1396-00
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