Calibrated Digital Predistortion Using a Vector Network Analyzer as the Receiver

Niubo-Aleman, Thaimi; Hahn, Yunsik; Roblin, Patrick; Teyssier, Jean-Pierre; Reynoso-Hernández, J.A.; Chen, Vanessa; Rajan, Siddharth

doi:10.1109/arftg.2019.8739180

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…Figure 10 shows the measurement system developed in [26,27], which aims to capture both static and dynamic behavior of the two amplifiers in a transmitter based on Doherty or Cheirex principles, as well as the behavior of the whole transmitter. In this system, the modulated baseband signals used to drive the inputs of the amplifiers are upconverted to RF frequency using a dual-channel AWG (Keysight M8190A).…”

Section: Large-signal Characterization Using Modulated Signalsmentioning

confidence: 99%

“…In order to accurately characterize dual-input devices using the testbed shown in Figure 10, the system has to be calibrated using the procedure introduced in [26,27]. Since the system comprises three ports (two inputs and one output), three-port relative calibration along with absolute power calibration are required.…”

Section: Calibration Of the Measurement Systemmentioning

confidence: 99%

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Advances in Microwave Large-Signal Metrology: From Vector-Receiver Load-Pull to Vector Signal Network Analyzer and Time-Domain Load-Pull Implementations (Invited Paper)

et al. 2022

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Radiofrequency (RF) power amplifiers (PAs) are important elements of modern communication systems. The most important components in PAs are the transistors, which are operated under large-signal regimes in such applications. Designing and optimizing PAs are challenging tasks that demand the highest accuracy on large-signal measurements at both device and circuit levels. Large-signal power transistor characterization demands the development and utilization of high-frequency and low-frequency load-pull systems. Furthermore, the static and dynamic characterization of two-input PAs requires the development of new measurement systems that consist of an nonlinear vector network analyzer (NVNA) and an arbitrary waveform generators (AWG). This paper reviews the research activities, achievements, and current research goals at CICESE Research Center in Mexico in the large-signal microwave metrology field.

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Section: Large-signal Characterization Using Modulated Signalsmentioning

confidence: 99%

Section: Calibration Of the Measurement Systemmentioning

confidence: 99%

Advances in Microwave Large-Signal Metrology: From Vector-Receiver Load-Pull to Vector Signal Network Analyzer and Time-Domain Load-Pull Implementations (Invited Paper)

et al. 2022

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“…While the inherent narrow IF BW of VNAs is typically insufficient for modern modulation BWs, techniques for measuring parts of the signal separately and then stitch them together with preserved phase and amplitude for the full-BW response have also been proposed [21]. These systems can make use of the built-in calibration features of the VNA system but need workarounds to handle the wide BW and to overcome the limited access to the internal hardware for timing and triggering [24].…”

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confidence: 99%

A VNA-Based Wideband Measurement System for Large-Signal Characterization of Multiport Circuits

Schulze,

Mengozzi,

Gibiino

et al. 2024

IEEE Trans. Microwave Theory Techn.

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This work reports on a wideband (WB) measurement system based on a vector network analyzer (VNA) topology for multi-port large-signal measurements. The setup exploits a modified commercial VNA with WB intermediate frequency (IF) outputs that allows for more than 5 GHz analysis bandwidth (BW), where the IF is captured using an external high-speed oscilloscope. A three-port configuration using six receivers is described, together with the signal processing to achieve the high dynamic range required for WB signal measurements. The calibration procedure to establish reference planes at the three ports of the device-under-test (DUT) are shown. A comparison is made between single-tone continuous-wave (CW) calibration and WB calibration using multi-tone signals, illustrating advantages, challenges and limitations. The system is then demonstrated for on-wafer WB characterization and linearization of a Dual Input Doherty Power Amplifier (DIDPA) using a 100-MHz instantaneous BW excitation signal at millimeter-wave frequencies. By leveraging on the error-corrected WB waves, an algorithm is proposed for modulated input signal control across a 600-MHz acquisition BW at the DUT on-wafer reference planes. The algorithm enables a user-defined emulated splitting of the input WB signals. The linearization performance of such an emulated PA configuration is finally evaluated.Index Terms-Digital predistortion (DPD), doherty power amplifier (DPA), millimeter-wave measurements, vector network analyzer (VNA), wideband measurements. I. INTRODUCTIONM ODERN applications of wireless telecommunications, as well as radar, exploit modulated signals at millimeter-wave frequencies with increasingly wider bandwidths (BWs), in the range of hundreds of MHz and beyond. Components and subsystems are therefore required to operate across large instantaneous BWs, so that instrumentation and characterization features need to be adapted to this demanding scenario. Nonlinear devices, such as radio-frequency (RF) power amplifiers (PAs), require network analysis to extract figures-of-merit (FoMs) like input and output match, available power gain, load-pull contours, etc. At the same time, they also require signal analysis FoMs like the error vector magnitude (EVM) [1]. As an additional complication, modern PA topologies addressing the ever-demanding trade-off between broadband linearity and power efficiency often result This work was partly funded by the German Federal Ministry of Education and Research (BMBF) under the project reference 16FMD02 (Forschungsfabrik Mikroelektronik Deutschland). C. Schulze, W. Heinrich and O. Bengtsson are with Ferdinand-Braun-Institut, Leibniz-Institut fuer Hoechstfrequenztechnik, Gustav-Kirchhoff-Str.

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Correcting nonlinear distortion of wideband modulated signals using new frequency domain methods

Kusano

Stav

et al. 2022

2022 98th ARFTG Microwave Measurement Conference (ARFTG)

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Calibrated Digital Predistortion Using a Vector Network Analyzer as the Receiver

Cited by 10 publications

References 7 publications

Advances in Microwave Large-Signal Metrology: From Vector-Receiver Load-Pull to Vector Signal Network Analyzer and Time-Domain Load-Pull Implementations (Invited Paper)

Advances in Microwave Large-Signal Metrology: From Vector-Receiver Load-Pull to Vector Signal Network Analyzer and Time-Domain Load-Pull Implementations (Invited Paper)

A VNA-Based Wideband Measurement System for Large-Signal Characterization of Multiport Circuits

Correcting nonlinear distortion of wideband modulated signals using new frequency domain methods

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