Doherty-förstärkare av flerstegstyp

摘要

A multistage Doherty amplifier is provided with separate drive amplifiers (DR4-DR5) for individual power amplifier (PA4-PA5) and/or separate drive amplifiers (DR) for groups of power amplifiers (PA1-PA3). This makes it possible to make significant improvements in efficiency and linearity by optimizing the drive for the different power amplifiers and using only a minimum of drive power.