LTspice tutorial - Differential transmission lines
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- čas přidán 17. 11. 2023
- #208 In this video I look at how a differential line can be modeled using LTspice. In general when modeling differential transmission lines, you don't just model the line to line coupling, but you also need to consider the line to ground coupling as well. Based on the lines exact geometry different couplings will exist, and an accurate model will need to consider this.
Further reading:
resources.pcb.cadence.com/blo...
www.researchgate.net/publicat...
LTspice Tutorial series:
EP1-Getting started:
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EP2-AC simulation and the Baxandall tone control circuit:
• LTspice tutorial - EP2...
EP3-.param and .step directives:
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EP4-How to import libraries and component models: • LTspice tutorial - EP4...
Ep5- Stock example simulations to play with: • LTspice tutorial - Ep5...
Ep6- Basics of FFT analysis and .four statment: • LTspice tutorial - Ep6...
EP7- Dependent voltage and current sources
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Ep8- Turning a datasheet into a component model
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EP9- Independent voltage and current sources
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Ep10- .wave statement and audio file processing
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Ep11 The effect of temperature on your circuit
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EP12 Modeling a DC brushed motor
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Ep13- Worst Case, Monte Carlo and Gaussian statistics circuit analysis
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EP14 - Digital circuits and logic gates • LTspice tutorial - Dig...
EP15- SMPS EMI and electrical noise and filters
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EP16- Feedback loop simulation
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Ep17 - Verifying Simulation Models
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Ep18 - Simulating Capacitors
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Ep 19 - Simulating Inductors
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EP 20 - Noise simulations
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Ep21 - Models and Libraries
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Ep22- Voltage and current limited source
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Ep23- Measuring Power Factor
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Ep24 - Modeling a vacuum tube triode
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Ep25- Using standard symbols
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Ep26- Modeling transformers
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Ep27 - Stepping sets of parameters
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EP28 - Simulating Quartz crystals
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Ep29 - Simulating gas discharge tubes
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Ep30 - LT tips and tricks
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Ep31 - Modeling switches
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EP32 - FREQ function
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Your job here is absolutely underrated.
Thanks for sharing.
Good explanation. I am surprised at how many things you can do with LTspice. Great job.
good job colleague
Thank you. By setting slightly longer Td's at the lines coupled with GND (in the 1st simpler model), FEXT, which appears on microstripline, can be reproduced. It is a quite discovery to me😃
Impressive clarity. Congrats.
Do you have Spice Parameters For e.g. a CAT5 or a USB3.1 cable?
Thank you
Very informative! I'm curious how you would go about simulating lossy transmission lines. I tried using the LTSpice "ltline" component but it says you have to add the .model which looks like you need the ltra.MDL file and I have been unable to find it or figure out how to create it and where to put it.
Actually, for the ltline, you can make a very basic model like the example in the help file (and throw this as a command into the simualtion):
.model MyLossyTline LTRA(len=1 R=10 L=1u C=10n)
there are some other possible parameters, but these 4 are the main ones you need.
Hmmm. The equation for Zcm = Z2||Z2 sort of was intuitive to make sense of. The equation for Zdiff = Z1||(Z2+Z2) was a bit harder for me to understand. Could you explain how this equation was derived?
Well, it has to do with the direct and indirect link between the 2 lines; Z1 is the direct link; and Z2+Z2 is the link trough ground - so there the link from L1 to GND which is in series with the link from GND to L2. Finally these 2 links are in parallel, so its Z1||(Z2+Z2)
Thank you