Question

2. Time-domain reflectometry is a technique used to analyze the integrity of a transmission line by looking at the signals reflected from impedance mismatches within the system. Consider the following circuit in which the electrical length and impedance of transmission line T3 are unknown: vout R1 Td=100n Z0=50 T1 Td=100n Z0=50 T2 T3 V1 50 PULSE(0 2.0 0 1ns 1ns 10ns 10us) .tran 0 1000ns 0 1ns R2 50 The signal observed at vout that is produced by the voltage source looks like this: Vivout) 1.0V 0.9V- 0.8V- 0.7V- 0.6V- 0.5V- 0.4V- 0.3V- 0.2V- 0.1V- 0.0V 0.1V- 0.2V+ 0.0µs 0.1µs 0.2µs 0.3us 0.4µs 0.5µs 0.6µs 0.7µs 0.8µs 0.9us 1.0? Calculate the electrical length and the impedance of transmission line T3 and explain your reasoning.

          2. Time-domain reflectometry is a technique used to analyze the integrity of a
transmission line by looking at the signals reflected from impedance mismatches within
the system. Consider the following circuit in which the electrical length and impedance
of transmission line T3 are unknown:
vout
R1
Td=100n Z0=50
T1
Td=100n Z0=50
T2
T3
V1
50
PULSE(0 2.0 0 1ns 1ns 10ns 10us)
.tran 0 1000ns 0 1ns
R2
50
The signal observed at vout that is produced by the voltage source looks like this:
Vivout)
1.0V
0.9V-
0.8V-
0.7V-
0.6V-
0.5V-
0.4V-
0.3V-
0.2V-
0.1V-
0.0V
0.1V-
0.2V+
0.0µs
0.1µs
0.2µs
0.3us
0.4µs
0.5µs
0.6µs
0.7µs 0.8µs
0.9us
1.0?
Calculate the electrical length and the impedance of transmission line T3 and explain
your reasoning.

2. Time-domain reflectometry is a technique used to analyze the integrity of a
transmission line by looking at the signals reflected from impedance mismatches within
the system. Consider the following circuit in which the electrical length and impedance
of transmission line T3 are unknown:
vout
R1
Td=100n Z0=50
T1
Td=100n Z0=50
T2
T3
V1
50
PULSE(0 2.0 0 1ns 1ns 10ns 10us)
.tran 0 1000ns 0 1ns
R2
50
The signal observed at vout that is produced by the voltage source looks like this:
Vivout)
1.0V
0.9V-
0.8V-
0.7V-
0.6V-
0.5V-
0.4V-
0.3V-
0.2V-
0.1V-
0.0V
0.1V-
0.2V+
0.0µs
0.1µs
0.2µs
0.3us
0.4µs
0.5µs
0.6µs
0.7µs 0.8µs
0.9us
1.0?
Calculate the electrical length and the impedance of transmission line T3 and explain
your reasoning.

Added by Tony G.

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