25. Nonlinear analysis of power amplifier using a dynamic power characterization

The determination of the nonlinear behavior of e.g. power amplifiers is often done using periodic excitations at different amplitude setting. The advantage of this way of working is that the applied spectra are well controlled. The drawback is that it requires different measurements at different power levels.

The aim is to use a single excitation signal whose amplitude grows over time such that it is possible to measure the amplifier’s characteristic using a single excitation signal. This will required additional signal post-processing as the measured output signals are no longer in steady state. In this thesis you will learn to

  • use ADS simulations and/or measurements to characterize amplifiers using periodic excitations at different power levels,
  • extract / determine the Best Linear Approximation (BLA) of the nonlinear device under test,
  • determine single (dynamic) excitations to determine the BLA using a single experiment,
  • determine the signal processing techniques necessary to compensate for the transient effect in the measurements.


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