Testing PAs under Digital Predistortion and Dynamic Power Supply Conditions

Different techniques for testing power amplifiers.


The power amplifier (PA) – as either a discrete component or part of an integrated front end module (FEM) – is one of the most integral RF integrated circuits (RFICs) in the modern radio. In this application note, you will learn different techniques for testing PAs through an interactive application note with multiple how-to videos.

To address these linearity and efficiency requirements, system designers frequently use linearization techniques such as digital predistortion (DPD) to improve linearity and use dynamic power supply (DPS) techniques, such as envelope tracking (ET) or direct polar (DP) modulation, to improve efficiency.

Table of Contents:

  • Behavioral Characteristics of Power Amplifiers
  • AM-AM and AM-PM Measurements
  • Memory Effects
  • Understanding the Effects of Nonlinear Distortion
  • Digital Predistortion (DPD)
  • Effects of DPD on a Modulated Transmission
  • Memoryless Look-Up Table (LUT)
  • Digital Predistortion for PAs with Memory
  • Memory Polynomial Model (MPM)
  • Generalized Memory Polynomial Model (GMP)
  • Testing PAs under DPD Conditions
  • Dynamic Power Supply Transmitters (Envelope Tracking)
  • Introduction to Dynamic Power Supply Techniques
  • Efficiency at the Transistor Level
  • Testing Dynamic Power Supply PAs
  • Addressing Synchronization and Alignment Challenges

Find more information here.

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