Contents I. Introduction
To support high data rates and spectral efficiency, telecommunication systems employ high-order modulation schemes. These modulation formats result in signals with large dynamic range and high peak-to-average power ratio. However, power amplifiers (PAs) at the transmitter front ends typically exhibit nonlinear gain characteristics. The non-linearity of PAs results in spectrum regrowth, which imposes limitations on the maximum RF output power due to strict spectrum mask requirements for point-to-point back-haul systems. Additionally, it is well-known that PA efficiency, particularly at mm-wave/sub-THz frequencies drops drastically at output power back off. These challenges highlight the potential of dynamic gate biasing, which can reduce dc power consumption at output power back off and provide greater supply current to maintain linear gain at high power levels allowing the PA to operate at more efficient region with modulated signals.
