Linearization of RF Frontends
Widespread adoption of higher order modulation schemes, larger signal bandwidths and higher operating frequencies, to enable higher data throughput in communication links like 5G, places increasingly tough demands on the frontend. Signal fidelity is often enhanced with linearization. The greater number of RF chains and signal bandwidth in 5G Frontends mean that DPD (Digital Pre-Distortion) may no longer be the default linearization choice. This white paper proposes a classification of Linearization schemes, introduces the hard limiter, illustrates linearization of an exemplary mmWave PA using non-DPD techniques, and introduces a class of linearized transmitters that create their signal and linearity from efficiently generated components.