Thread: X-parameter modeling

Hi Willow,

X-Parameters are NOT the same as LSSP. They are a nonlinear representation of a component or circuit, including harmonics. Very soon (if not already), there will be an X-parameter extractor in ADS to use instead of LSSP. And as you noted, there is already an instrument that can measure X-parameters which can be used right now in ADS.

Here are a couple of links for more information. I'll try to find more links tomorrow.
X-parameter training class
PolyHarmonic Distortion (PHD) Model (The PHD Model uses the X-parameters in simulations)
If you register for the Virtual Expo, you can supposedly download material from the IMS MicroApps presentations. You want this one in particular: Nonlinear Vector Network Analysis and Applications of X-parameters

"
This workshop will discuss the Agilent Nonlinear Vector Network Analyzer (NVNA) as well as the application of X-parameters for the design and analysis of active components. Measurements of complex stimulus/response component behavior as well as measurement and calibration configurations will be discussed. Details on the applications of measured X-parameters in design and validation of active components including the simulation/optimization of complex stimulus/response behavior in ADS will be discussed. New load dependent measurement based X-parameters will be introduced and used in the simulator providing an efficient and correct method for the designer to maximize linearity with a nonlinear model that is valid over a wide range of impedances.
"

You might also find this one useful: Load Pull with X-Parameters Produces Instant Large Signal Model with High Accuracy

Hello!

I'd like to ask some maybe stupid question about X-parameters modeling. Especially about model equations (i.e. b(i,j) =.....)

So.

In the second sum we have subscript (k,l) != (1,1), i.e. it means that k index and l index cant be equal to 1 simultaniously. In my opinion it means that we do not need, for example, XS(2,1,1,1) and XT(2,1,1,1)...

But if we look in the xnp-file (see attached file), you can see that we have both XS(2,1,1,1) and XT(2,1,1,1)

Another question how to calculate manually the b(i,j) wave......

I've read a lot of papers about PHD and X-parameters and didnt find the information about it!!

Can you answer on my question, dear colleagues?

Thank you very much!

Andrey.