Modelithics, Inc Logo
World’s Best RF & Microwave Simulation Models
X-Parameter Files

X-Parameter Services

Modelithics, a Keysight Technologies Solutions Partner and provider of precision measurement and modeling services, offers custom non-linear *X-Parameter measurements and *X-Parameter model development.

View Modelithics X-Parameters Example files and X-Parameters model listing

Please see our additional services for characterization and modeling. For examples of some of the Modelithics services, see our literature area

Modelithics Services

*X-Parameters Measurement and Modeling Services brochure
Interested in a free, no obligation quote for Modelithics Characterization or Modeling Services?

  • Non-Linear X-Parameters
  • Provide mathematically correct extensions of S-parameters to large-signal conditions with fully nonlinear framework that provides both the magnitude and phase of the distortion.
  • Cover both large-signal and small-signal conditions, and capture complete linear and nonlinear behavior at all loads.
  • Characterize the amplitudes and relative phase of harmonics generated by components under large input power levels at all ports.
  • Correctly characterize impedance mismatches and frequency mixing behavior to allow accurate simulation of cascaded nonlinear xparameter blocks, such as amplifiers and mixers in wireless design.
  • Apply to individual transistor modeling as an alternative to, supplement to, or validation of traditional compact equivalent circuit modeling.
  • Can be measured using a non-linear vector network analyzer, such as a suitably optioned Keysight PNA-X series instrument.
  • Can be measured as a function of impedance and bias.
  • Can be simulated in multiple circuit simulation tools, such as Keysight ADS and Keysight Genesys software.

Download and complete the Active Services request form and email to Modelithics Sales

Reproduced with permission, courtesy of Keysight Technologies, Inc


X-Parameter Literature

Title LiteratureType Author Date
Simulating Modelithics X-Parameter Amplifier Models in a Keysight Genesys Design Environment Published Papers Free Chris DeMartino, Modelithics 4/23/2020
Using Modelithics X-Parameter Models in an ADS Design Environment App Note Free 9/20/2017
Working with Modelithics X-Parameters*-Based Models for Mini-Circuits Amplifiers Presentations Dr. Larry Dunleavy 8/10/2017
An Evaluation of Static Single-tone X-parameter Models in Time-varying Envelope Domain Simulations of Intermodulation Distortion Performance Published Articles K. Kellogg, J. Liu, and L. Dunleavy of Modelithics.Inc 4/30/2015
*X-Parameters Measurement and Modeling Service Brochures Modelithics, Inc. 1/1/2014
Unleash Compact Transistor Models With X-Parameters Technology Brochures Modelithics, Inc. 1/1/2014
Tutorial –*X-Parameters-Based Models for Mini-Circuits Amplifiers Video (U tube) Dr. Larry Dunleavy 7/13/2013
Mini-Circuits Sponsors Free Modelithics X-Parameter* Models for Popular Surface Mount Amplifiers Press Release 5/31/2013
Take A Look at *X-Parameters with us Press Release 3/6/2013
Power Amplifier Design with *X-Parameter Power Transistor Model Presentations Larry Dunleavy in an Agilent Technologies sponsored webcast September, 2012 9/6/2012
Modelithics Expands *X-Parameter Services and Releases Significant Update to Modelithics COMPLETE Library for Agilent Genesys Press Release 3/12/2012
A Benchmark Comparison of *X-parameter, P2D and S2D Models for Representing Microwave Amplifier Performance Presentations 2011 IEEE Topical Symposium on Power Amplifiers for Wireless Communication 11/29/2011
Evaluating *X-parameter, P2D and S2D Models for Characterizing Nonlinear Behavior in Active Devices Published Papers Free Jiang Liu and Hugo Morales, Modelithics Inc.; Lawrence P. Dunleavy, Modelithics Inc. and University of South Florida; and Loren Betts, Agilent Technologies 11/1/2011
Modelithics Takes Circuit Design Success to a New Level with the Introduction of *X-Parameter Modeling Services Press Release 3/15/2011

*X-parameters is a trademark and registered trademark of Keysight Technologies in the US, EU, JP, and elsewhere. The X-parameters format and underlying equations are open and documented. For more information, visit Keysight X-Parameters Information