R&S®SMW-K546 Digital Doherty

DigitalDoherty Setup
DigitalDoherty Setup

Doherty amplifiers, especially those with two independently driven inputs (dual input), promise significantly better energy efficiency in 5G base station transmitters and similar applications. Regardless of the Doherty implementation (e.g., fixed RF input splitter, programmable RF input splitter, dispersive input splitter, dual input, …), the question remains the same for a designer: how do I obtain the best performance for the desired application?
Only by stimulating the two amplifier inputs with a range of different signals is it possible to identify and understand the performance trade-offs and sensitivities. Conventional designs such as fixed RF input splitter, programmable RF input splitter and dispersive input splitter benefit especially from such measurements, as it enables the designer to obtain previously inaccessible information to decide on the best split architecture for the desired application. The R&S®SMW-K546 Digital Doherty software option helps designers realize the full potential of their Doherty amplifier designs and offers the following benefits:
- Better view of performance tradeoffs
- In-depth understanding of sensitivities
- Information to select the best input split and specify performance with confidence

Doherty Measurement Setup
Doherty Measurement Setup

The R&S®SMW-K546 Digital Doherty software option makes it easy to fully explore the performance potential of all Doherty amplifier designs. Shaping functions, level and phase adjustments as well as digital pre-distortion can be easily configured in just seconds and applied in real time using the intuitive GUI. Time-consuming waveform recomputation after each change of parameter settings is not required due to the real-time functionality. This allows the designer to explore the impact of various parameters on the performance of their Doherty designs in real-time and to quickly find the input split settings and shaping functions that yield the best performance.
The R&S®FSW signal and spectrum analyzer with the R&S®FSW-K18 amplifier measurements software option provides the corresponding measurements, capturing not only scalar quantities like spectral regrowth and EVM, but also vectors like AM-AM and AM-PM.

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