Questions tagged [tdr]
The tdr tag has no usage guidance.
36
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Can I measure the internal termination resistance of a MIPI receiver?
This question is further to: How accurate are internal terminators on chips with high speed differential inputs?.
I would like to measure the actual termination resistance inside one of these chips (...
- 27.5k
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0
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24
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Origin (t=0) of the time axis shifted after TDR on two sets of different S11 data
I have two sets of S11 data (S1P format) which are measured on an open co-axial cable (~ 20 cm long) and open-end as reference (see the hand-draw figures below) correspondingly. I used the Python skrf ...
- 51
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1
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116
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How to read a TDR report?
This is the report generated from Keysight ADS. I can see the reflections from the vias and layer change (impedance swing) but I couldn't figure out the impedance of the actual traces. Also, why are ...
- 19
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65
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Time domain reflectometer (TDR) to check health of voice coil
I have some large voice coils in which the insulation is failing. We first notice this when the amplifier trips off on over current (short to ground.)
I'm wondering if before the catastrophic fault ...
- 146
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2
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168
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Time domain reflectometry and resolution
Regarding the temporal (and consequently spatial) resolution of a TDR system, I've read from different sources that the maximum resolution achievable is half of the rising time of the input step ...
- 95
19
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8
answers
4k
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Electricity only flows in a complete circuit, so how does TDR (time domain reflectometery) work?
In high school we were all taught that electricity only flows in a loop. But it seems that one can send a "pulse" down an open conductor. This is used in a time-domain reflectometer. How is ...
- 301
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1
answer
217
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what is the alternative method for time domain reflectometry
I have read that TDR is problematic because if we have many transmission lines in series which cause discontinuity to the source resistance ,then the closer TL's will mask the reading of the far TL ...
- 157
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votes
3
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6k
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Frequency domain S11 conversion to time domain TDR
Below we see the S11 plot of a transmission line, the Wikipedia definition of the reflection coefficient as a function of S-params.
As I see it, the S-param frequency domain plot comes from the time ...
- 157
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votes
1
answer
433
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How can I convert from voltage TDR into impedance TDR
Based on the circuit below I have built the voltage based TDR diagram.
Then I went to the ADS TDR simulation and constructed by the manual the circuit below.
In the ADS circuit they say that IMPEDANCE=...
- 157
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114
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time domain reflectometry interpretation of a simple circuit
I have constructed the following circuit in HSPICE,and it gives me the following waveform
I know that we have the first wave hit node 3 then it goes back and again to node 3.
But how we construct the ...
- 157
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513
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Op- amp comparators and temperature dependent resistor
The circuit in Fig 1 consists of a temperature dependent resistor (TDR). Compute the:
temperature at which the comparator will change state.
2)supply voltage required for a 40°C trip point in Figure ...
0
votes
1
answer
94
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Three wire parallel transmission line (TDR)
I have a three wire parallel transmission line with a length of around 1000m. The wires are really close to each other. I want to sample the response of the transmission line for two different pulse ...
1
vote
1
answer
131
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Could a time-domain reflectometer, with no access to earth-ground, indicate if a long-wire is attached to the end of a long steel beam?
Without using any other wiring, optics, RF, sound, or vibration, I need to know if a 100 meter length of electrical wire is attached to the end of a 50 meter long steel beam.
I only have physical ...
- 13
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votes
3
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142
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time domain reflectometry on long cables
Is it possible to use time domain reflectometry on cables with a length of more than 100km?
What kind of problems do time domain reflectometers on that long cables face?
- 363
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1
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100
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TDR unexpected results
I am using a signal generator to generate a long square pulse that is fed into a long transmission line consisting of two parallel wires. The transmission line is approximately 1km long. The near end ...
- 363