  A comparison of nonlinear vector network analyser (NVNA) measurements has
been carried out involving four organisations (National Physical Laboratory,
UK, University of Surrey, UK, Chalmers University of Technology, Sweden and
Keysight Technologies, Denmark). Three nonlinear devices consisting of two
amplifiers and a nonlinear verification device (NLVD) were measured by each of
the organisations. Results are presented which show generally good agreement
between the measurements and give some indication of the typical amount of
variability to be expected in measurements of this type.
