RF & microwave components

Doherty, Balanced, Push-Pull & Spatial Amplifier Performance Enhancement

The Doherty Amplifier continues to be rolled out in an increasing number of TxFE (Transmit Frontend) applications, as the quasi-linear amplifier architecture of choice.

The advent of 5G, with its inevitable microwave or millimeter wave air interface, increase the design challenges associated with its construction; not least of all because of the potential for increased dispersion in the constituent amplifiers and combiners.

This application note describes a measurement-based development methodology by which the Doherty Amplifier may be enhanced, increasing performance and/or performance bandwidth. This methodology is supported with a working example.

The methodology may also be extended to balanced, spatially combined and anti-phase (so called "pushpull" or "differential") amplifiers, the latter often itself nested in Doherty configurations.

The R&S®Quickstep sequencing software may be downloaded from:

https://www.rohde-schwarz.com/software/quickstep/

Name
Type
Version
Date
Size
Doherty, Balanced, Push-Pull & Spatial Amplifier Performance Enhancement |1MA279
Type
Application Note
Version
2e
Date
15-Nov-2017
Size
4 MB
DohertyCharacterization | 1MA279

The Quickstep project used for calibration and rapid characterization of the DUT. Instructions for the installation of the Quickstep project are given in a readme within the archive.

Type
Application Note File
Version
Date
31-Oct-2016
Size
7 MB
CST_Macros_R+S | 1MA279

A macro for use with Studio Suite, enabling automatic creation of Rat-Race + Schiffman networks from user defined parameters.

Type
Application Note File
Version
Date
26-Sep-2016
Size
22 kB
CST_solution5_wilkinson | 1MA279

A Studio Suite solution with Wilkinson splitter + High-pass + Low-pass filter, illustrating solution 5 of the Application Note.

Type
Application Note File
Version
Date
26-Sep-2016
Size
181 kB
3GPP Type License Free Signal Library | 1MA279

A library of license free signals, for use with the R&S®SMW200A signal generator, similar to those used in the Application Note to (i) calibrate and (ii) characterize the DUT.

Type
Application Note File
Version
2.0
Date
26-Sep-2016
Size
2 MB
CST_solution1_models | 1MA279

A Studio Suite solution with Wilkinson splitter + High-pass + Low-pass filter, illustrating solution 1of the Application Note.

Type
Application Note File
Version
Date
26-Sep-2016
Size
3 MB
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