All Questions
Tagged with impedance-matching characteristic-impedance
36
questions
1
vote
3
answers
111
views
How to match multiple impedance discontinuities?
I am trying to design a circuit to transmit various digital high frequency signals over cables, connectors and pcb to an oscilloscope. The simplified circuit looks like this:
simulate this circuit &...
- 49
0
votes
1
answer
48
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Coax cables, impedance matching and BNC extensions
I'm trying to understand how to do proper measurements with a Voltage Differential Probe ( TT-SI 9010. This probe has an output impedance of 50ohm and has a BNC (It doesn't specify it in the data ...
- 324
0
votes
2
answers
58
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Balun converting 100ohm single-ended trace to 50ohm single ended for spectrum analyzer
On my board, I have 100ohm differential pair traces connected to a 1:1 balun, so the signal impedance becomes 100ohm single ended. I would like to measure the signal spectrum with spectrum analyzer. ...
- 679
1
vote
1
answer
74
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Confusion About Impedance Matching For Single-Ended and Differential Lines
I understand that for single ended RF signals I must ensure that the characteristic impedance of the transmission line matches the load impedance (say 50 ohm). I am a bit confused for differential RF ...
- 31
3
votes
5
answers
983
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Connector impedance matching
The importance of termination matching the cable is emphasized all the time. But before the wires reach the termination resistor they usually pass the connector. I've only seen the impedance specified ...
- 12.9k
1
vote
1
answer
193
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How to do impedance matching when when all 3 characteristic impedances differ? [closed]
If we have a circuit like this and we need to do impedance matching on smith chart. How would we go about doing it? I think you would have to first normalize with the Zo1 and go to the 1+jX circle and ...
- 11
2
votes
2
answers
873
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What does a 50 ohm coax "look like" when neither the source nor the load are matched to it, and the center conductor and shield are used for signals?
Say I have a π-network filter for which the inductor is on a separate board. For convenience, I use a 50 ohm coax (4" long, frequency is 13.56 MHz) to connect to the inductor, using the center ...
- 639
2
votes
2
answers
2k
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Output composite video (PAL) signal from FPGA DAC, totally lost in the analog domain
I'd like to start generating (and perhaps also capturing) composite video (PAL) signals from a digital source, eg. FPGA. However, while my digital logic/programming skills are covered, I'm lacking a ...
- 123
0
votes
2
answers
288
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Thevenin equivalent of open ended transmission line Clarifications required
I am going through the below link for understanding about transmission line reflections.
The below figure is an equivalent circuit of an open-ended transmission line. For finding the
the voltage at V+ ...
- 2,593
1
vote
2
answers
5k
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Differential impedance matching
Below is a small portion of a schematic which I have seen:
It mentions that the transmission lines will have a differential impedance of 100 Ω between them.
In case of single-ended it would be 50 Ω ...
user220456
7
votes
3
answers
2k
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Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope
I am a power electronics engineer in R&D and often measure fast switching waveforms, specifically high bandwidth MOSFET gate signals. When connecting oscilloscope probes in the past I have found ...
- 81
0
votes
1
answer
490
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Calculating lengths of single-stub transmission line when all 3 characteristic impedances differ
Consider a transmission line circuit like the following but where \$Z_{o2}\$ was also unique (say \$Z_{o2}=7\,\Omega\$):
I know how I would find \$l_1\$ and \$l_2\$ using smith charts:
$$Re\left\{Y_n(...
- 177
0
votes
3
answers
2k
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Deriving the S-parameters, different Matched Loads possible?
I guess this is more of a conceptual question but for the problem below Im having trouble getting started on how to derive the S parameters for the network.
I noticed that the network at 28.025 GHz ...
- 1
0
votes
1
answer
111
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Matching line driver output impedance over wideband
I'm designing a high impedance line tap for 10-10GBASE-T ethernet signaling. In the AFE I have a JFET LNA for high input Z which goes to a var. gain amplifier that is a fully differential ADC driver. ...
2
votes
1
answer
307
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Coax Cable Wave Impedance, Capacitive Load
I am studying the behaviour of cables over frequency, especially what a source sees, and have 2 Questions, as I did some simulations in LtSpice. As a model for the cable I used the "Lossy ...
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