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29th April 2019, 05:27 #1
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How do we get Sparamter results with "term" used as inputoutput in ADS

29th April 2019, 06:54 #2

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29th April 2019, 13:35 #3
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
is their any doucument which can show me how "term" in ADS or "port" from cadence are used to calculate sparamter?. I went though internet but it only shows me, place port and do connection and you will get this result. I dont want this. I want some simple and clear explanation.

29th April 2019, 14:12 #4

29th April 2019, 15:27 #5
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
I think you have not got my question. I know about S, Y and Z but here my concern is how "term" is used to calculate it. I mean here I have not define any signal in "term" componant e.g vtg level, power level etc but still I am getting output. As per my knowlege concern, if you dont give nay input to DUT then you should not get any output.

29th April 2019, 15:40 #6

29th April 2019, 15:42 #7
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
You can not understand them at all.
It specifies reference impedance.
Reference impedance is required for Sparameter.
On the other hand, Y or Z paramete don’t require reference impedance.
Any stimulus signal is not required for calculating Y or Z parameter.
Surely learn kindergarten level linear circuit theory.Last edited by pancho_hideboo; 29th April 2019 at 15:52.

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29th April 2019, 15:58 #8
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
That is what I was asking. Do you know what is default value of low signal ADS using to simulate circuit?
   Updated   
[QUOTE=pancho_hideboo;1648212]You can not understand them at all.
It specifies reference impedance.
Reference impedance is required for Sparameter.
On the other hand, Y or Z paramete don’t require reference impedance.
Got answer on below link
https://www.maximintegrated.com/en/a...ex.mvp/id/2866

29th April 2019, 16:03 #9
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
Still you can not understand things correctly.
There is no stimulus signal in Sparameter Analysis in both Keysight ADSsim and Cadence Spectre.
“Term” or “port” define only reference impedance.
No stimulus signal.
Surely learn kindergarten level linear circuit theory.Last edited by pancho_hideboo; 29th April 2019 at 16:09.

29th April 2019, 17:57 #10
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29th April 2019, 22:33 #11
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
Sparameter simulation is a subset/kind of AC Simulation so there is a very low level stimulus but hidden.Otherwise simulation will not run without no source condition.
This is valid also in EM simulations.When you place a Port, in fact you have been placing a generator with a very small voltage level.The EM simulator computes the rest..

30th April 2019, 02:41 #12
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
Wrong.
There is no stimulus signal in Sparameter Analysis.
Any hidden signal does not exist.
Assume circuit with many ports.
If we do analysis with changing port exciting, it is too uneffective.
Any stimulus signal is not required for calculating Z or Y parameters.
Here we don’t have to calculate any node voltage or branch current.Last edited by pancho_hideboo; 30th April 2019 at 03:08.

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30th April 2019, 04:44 #13
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
Last edited by BigBoss; 30th April 2019 at 04:50.

30th April 2019, 05:01 #14
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
Wrong.
You are misunderstanding.
It is true for DC and Transient Analysis.
But it is not true for small signal linear analysis.
Assume state space formulation.
Matrix A,B,C and D for small signal analysis can be calculated by DC Analysis.
Here small signal stimulus is not used at all.
Y, Z or S matrix can be derived from {A,B,C,D} directly without stimulus.
Evaluation of Sparameters is different between circuit and EM simulation.
If we use same method as EM simulation, it is too ineffective and high computing cost for circuit simulation.
Consider a meaning of “conceptually” in https://www.edaboard.com/showthread.php?383978#2Last edited by pancho_hideboo; 30th April 2019 at 05:29.

30th April 2019, 05:49 #15
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS

30th April 2019, 06:15 #16
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Re: How do we get Sparamter results with "term" used as inputoutput in ADS
It is very natural, since you do AC analysis.
AC analysis requires at least one small signal stimulus, since it calculates node voltages and branch current.
Wrong.
You are completely misunderstanding.
Sparameter Analysis does not require any small signal stimulus.
Rather if you include small signal sources in schematic, Sparameter analysis ignores them.
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