[SOLVED] ADS-Transient simulation with schematic including a block of s2p file

[maryamtele]

Dear Friends,

I am simulating a schematic in time domain (transient simulation) which includes a block defined by a s2p file.
I need to figure out what kind of algorithm(equations) ADS uses to extract the results in time domain?

Thanks in advance

 

[pancho_hideboo]

ADS build FIR filter model from S-Parameter.
Then it is used as convolution in transient analysis.

See http://edocs.soco.agilent.com/display/ads2009/Troubleshooting+a+Transient-Convolution+Simulation

 

[maryamtele]

ADS build FIR filter model from S-Parameter.
Then it is used as convolution in transient analysis.

See http://edocs.soco.agilent.com/display/ads2009/Troubleshooting+a+Transient-Convolution+Simulation

Thank you so much, I will read it and if I have furthur question I will ask you.

- - - Updated - - -

Dear Pancho

I searched but I didn't find how we can build a FIR filter from S2P file and also how we can use it to perform transient analysis.
Would you please explain a little more about the process or put a link to help.
Thanks

 

[pancho_hideboo]

I searched but I didn't find how we can build a FIR filter from S2P file and also how we can use it to perform transient analysis.

(1) Convert {s11,s12,s21,s22} to {y11,y12,y21,y22}.
(2) Calculate impulse responses of {y11,y12,y21,y22} by IFFT(Inverse FFT) of {y11,y12,y21,y22}.
(3) Evaluate i1(t) and i2(t) by convolving impulse responses of {y11,y12,y21,y22} with v1(t) and v2(t).

 

[maryamtele]

Dear Friends,

I have gotten an "impulse response" for my s2p block using impulsewriter.
Now I need to apply this impulse response to my circuit to find voltages and currents of a step-function source. How can I do that? which simulation do this? how can I read this .imp file to a component in my circuit?
Please help, I need it ASAP
tnx

 

[pancho_hideboo]

How can I do that? which simulation do this? how can I read this .imp file to a component in my circuit?

You don't have to evaluate impulse response.
Simply run transient analysis using s2p block.

 

[maryamtele]

I simulated s2p file in transient simulation but according to the document I have attached but because of problems of causality and passivity, agilent suggests it is better to use Impulsewriter. I simulated it in transient but the results were not reasonable. What do you suggest?

 

[pancho_hideboo]

I simulated it in transient but the results were not reasonable. What do you suggest?

I can not give any advice unless you show profile of your s2p block and necessary frequency bandwidth required for step response evaluation.