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Is it possible to simulate a lossless transmission line in TINA-TI v9? I don't have to have a schematic symbol for it, I'll be okay with importing text to instantiate it.
By the way, this simulator has become my go-to simulation tool because of its ease of use and the breadth of library.
Joe
Joe,
We do not have any ready-made TINA models of lossless transmission lines.
The most likely way to do it is to create some subcircuit blocks with the idealized equations.
We have found that simulations using ideal lossless lumped components (L's and C's) struggle to converge until a small amount of loss is added.
Don't know if the lossless transmission lines will behave the same way, but it might be good to keep it in mind.
Please let me know if you have any questions.
Thank you for your interest in TINA-TI.
Regards,
John
Joe,
There are two models for transmission lines that I have used in TINA Industrial. Perhaps one of these will help you. Please take a look at the attached file.
Britt
Thanks Britt,
I am happily using the lossless model now. I have a little work to do to get my application of the rlgc model to behave as I expect but the lossless model is very much sufficient for what I am doing.
Thanks again!
Britt,
I download the 5102.trans_5F00_line.TSC and open it in TINA-TI.
set the time delay to 5us and characteristic impedance to 100, then connect it to a voltage generator to give 1MHz sine wave and terminated with 1K.
to see the output of the transmission line, it always zero.
question is how to operate it in TINA-TI?
Regards,
Thomas
Thomas,
It appears to work for me. Perhaps your simulation time in the transient window was less than 5u. If that is the case, then you would not see anything at the output of the transmission line. Please see the attached example.
Britt
I've attached an application schematic that simulates.
Make only 1 change at a time (either to the schematic or to your simulation options and controls) until it stops working or you get to the schematic you want simulated.
Joe
Hi all,
0434.Model_Param_Error____Lossy_TX_Line.TSC
Has anyone had any luck with getting the lossy model working? All I can get is a cryptic "Model parameter error"
I've got sensical numbers entered for RLCG and E length...
Thanks,
Adam
Thanks Brit,
Well, I think I maybe found the issue, I found this note on spice for the LTRA model:
The types of lines implemented so far are : uniform transmission line with series loss only
(RLC), uniform RC line (RC), lossless transmission line (LC), and distributed series
resistance and parallel conductance only (RG). Any other combination will yield erroneous
results and should be avoided. The length (LEN) of the line must be specified.
I set G=0 and sure enough, no more parameter error. So it seems this can't really do RLCG, just RLC.
Please let me know if you find different.
Thanks!
Adam
Adam,
I believe that the Lossy transmission line only works with the following combinations of parameters:
LC, RLC, RC, and RG
In your example, if you set G to 0, the simulation will run.
Britt
Adam,
We must have been typing at the same time! You are very correct and DeisgnSoft has confirmed.
Britt