Outphasing, Envelope & Doherty Transmitter Test & Measurement
Application Note Overview
As time goes on, the energy efficiency of RF Frontends (RFFE), especially transmitters, continues to gain greater prominence. Meeting the challenges of efficiency is increasingly difficult at higher operating frequencies and bandwidths, such as those proposed for 5G.
There is a group of transmitter RFFE architectures whose signal output is constructed from two or more efficiently generated components. This signal construction, in effect, means that such architectures use predictive, post-correction linearization, enabling the distortion to be eliminated entirely.
The capabilities of multi-channel signal synthesis setups with R&S®SMW200A, in combination with the R&S®FSW analyzer, enable the measurement and development of these types of transmitters.
This application note from Rohde & Schwarz focuses on devices for the 3.5 GHz NR (5G New Radio) candidate band. Still, its findings are equally applicable to developments and measurements for, for example, K-band satellite applications or mmW NR candidate bands, where efficiency is an even more crucial design target.