Solutions for Implementing Envelope Tracking in Power Amplifiers

Application Notes

Overview

By their very nature, Power Amplifiers (PAs) are power hungry, nonlinear devices. They are also a critical component in modern mobile communication devices like smartphones and tablets, which hold increased battery capacity and power efficiency at a premium. PA techniques like Crest Factor Reduction (CFR), Digital Pre-Distortion (DPD) and Envelope Tracking (ET) were introduced as a way to overcome these issues, while at the same time reducing problems associated with distortion and nonlinearity. ET offers significant advantages in terms of improved battery life and RF PA performance, along with reduced heat dissipation. Also, it’s an increasingly important capability for PAs that support high peak/average modulation schemes. With smartphones and tablets increasingly employing wider bandwidths, Multi-Input Multi-Output (MIMO) technology, and higher order Orthogonal Frequency Division Multiplexing (OFDM) modulation formats to achieve higher data rates, the use of ET is projected to become even more critical.

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Solutions for Implementing Envelope Tracking in Power Amplifiers

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