checking for oscillation in LNA design in AWR MWO

[young.microwave.eng]

Dear Roomates
I've designd some X-band LNA and I'm looking for some methods to chech if
there is any oscillation at the output of LNA?
would you please help me do that?
Thanks in advance

 

[BigBoss]

If your LNA has single stage, K and Mu factor stability chekings will be sufficient.
But if it has more stage, NDF ( Normalized Determinant Function ) should be investigated.For more information..
See "NDF_Workshop" in MWO Examples...

 

[vfone]

Don't forget to check for oscillations in a wide frequency range, perhaps starting from few tens of MHz.

 

[tony_lth]

Up to 40GHz.

---------- Post added at 01:57 ---------- Previous post was at 01:50 ----------

BigBoss,

What is the version of your AWR? My AWR is 2008 version, and I don't find "NDF_Workshop" in MWO Examples.

 

[Manjunatha_hv]

Hello Tony,

You must have AWR MWO 2009 v9.0 or higher to see this example....
Also go through the Amplifiers topic from "Microwave and RF Design A Systems Approach" book by Michael Steer,
which shows different ways of checking stability such as "u"...

---manju---

 

[young.microwave.eng]

dear roomates
thanks for your replies.I cheched to fined the mentioned feature that bigbss said but I could otr find it in MVO 2008 and 2009.would you please help me more?

 

[BigBoss]

I have attached..But I don't know it is extractable with previous versions..
Try and see...