Filter s2p file problem

[cmkrkmz]

hi guys,
I am designing a downconverter system in AWR VSS, and got a problem. I import a s2p file of a filter that i will use in the IF stages, but it doesn't work. I mean; if i connect a tone to the subcircuited s2p filter, i see the expected level correctly that i would calculate with S21 data of the s2p file at related frequency (tone power plus S21(dB)), but when i use a mixer and get the same frequency that i mentioned earlier, the filter does nothing !
Would you please help?
Regards,

 

[Manjunatha_hv]

Hello Cem,

Did you use LIN_S block for S2P file in AWR VSS? If not use this block it works...

If so then upload ur VSS file *.emp & corresponding touchstone *.S2P file


---manju---

 

[cmkrkmz]

Hello Manju,
Yes i used LIN_S.
The files are attached. Please see the Design Notes.
Thanks
Cem

 

[Manjunatha_hv]

Hello Cem,


Yes you are right...!
But the system diagram to test this filter is not suitable & settings too not ideal for this filter test...

I have created a new system diagram the"Filter Test" where I used simple RF Tone & the Filter...
Then plotted the spectrum, & is working fine as expected...
Also I created a S-parameter network analyzer setup system diagram...
The modified AWR VSS file is attached, see all the plots....

hope this helps you....

---manju---

 

[cmkrkmz]

Hello Manju,
Thank you for your time and effort. I see that the filter is working individually as expected.
But, is there any chance to see that it is also working with the entire system, I mean I must see that it is working after the MIXER_F. Because I will add some other components to the system and I should show that the entire system is working correctly.
You mentioned that the settings is not ideal for testing, what can we do?
thanks,
Cem