Measurement-aided Doherty amplifier design - chapter 9

RF microwave components
RF microwave components

Significant improvements in Doherty performance can be achieved by addressing the input side. A measurement-aided methodology for extracting and understanding this performance is presented. The use of linear, intentionally dispersive or programmable input splitting can improve performance, especially in the industrial domain. The use of non-linear input splitting, according to peer reviewed research, the advantage could be 60% more output power, 20% more efficiency, 50% more bandwidth with any degradation in predictive linearization. In this case, the improvements over a fixed bandwidth were 47% for output power and 11% for energy efficiency.

Regardless of which technique is used, by providing a more detailed and rigorous insight, this methodology can improve both the time-to-market and improve the cost-specification paradigm. Although exemplary quantities and their post-processing have been presented, these are in no way exhaustive, and may be swapped out for other parameters without changing the methodology.

Finally, the test platform may be extended, through the use of a 2nd ARB generator, to perform (for example), dual-DPD or digital Doherty with memory effect compensation.

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Gareth Lloyd

Gareth Lloyd

Gareth Lloyd graduated from the University of Leeds in 1994 with a degree in Electronic & Electrical Engineering. Gareth has worked in various engineering and management roles, in different industries, for major companies including Ericsson, Huawei, ZTE, TriQuint and Andrew Corporation. Gareth joined Rohde & Schwarz in 2015, as a Senior Expert. His primary work focus is performance differentiated radio front-ends (RFFE).

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