Out-of-Band Digital Predistortion for Power Amplifiers With Strong Nonlinearity

Active Load-Modulated Devices: A General PA Network Solution Identifying Highly Efficient Linearizer Systems

“…The most widely used linearization process for telecommunication applications is digital predistortion (DPD). Unfortunately, DPD becomes less and less effective as the transmit PA operates at higher compression levels, as the correction necessary to counteract the non-linear effects can grow without bounds [6]. In contrast, AM/PM correction requires phase rotation, which is still possible with DPD even in compression.…”