Digital Cancellation of the Remodulation Effect in IQ RFDAC Based LTE Direct Conversion Transmitters

Markovic, J.; Kanumalli, Ram Sunil; Preyler, Peter; Mayer, Christian; Huemer, Mario

doi:10.1109/vtcfall.2017.8287953

Cited by 4 publications

(3 citation statements)

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“…Furthermore, the so-called remodulation occurs due to the pulling effect caused by the electromagnetic coupling of the RF-DAC and the used digitally controlled oscillators (DSOs) of the DPLL, generating undesired spurs and thus degrading the EVM and ACPR. Detailed analysis and digital cancellation technique were proposed by Markovic et al [28].…”

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%

“…10 [4]. The direct and the indirect learning methods have been applied [1] using the complex-valued least-squares algorithm (28) to estimate the coefficients. Coefficient estimation and predistortion are combined in the DPD block in Fig.…”

Section: A Evaluation Setupmentioning

confidence: 99%

“…DPD concepts targeting specific nonlinear effects of capacitive RF-DACs have been proposed by This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ Markovic et al [28], [29]. The resulting mathematical models are based on the detailed analysis of the origin and the resulting effects of the nonlinearities of the RF-DAC design, resulting in low complexity, but powerful DPD approaches.…”

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A Circuit-Inspired Digital Predistortion of Supply Network Effects for Capacitive RF-DACs

Trampitsch

Kalcher²,

Enzinger³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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This article presents a novel digital predistortion (DPD) approach to compensate for nonlinear dynamic distortions caused by the supply network of capacitive radio frequency digital-to-analog converters (RF-DACs). The developed DPD concept recreates the voltage distortion on the RF-DAC's supply network and modulates the input signal such that the effects on the output signal of the RF-DAC are canceled. In contrast to conventional DPD approaches such as pruned Volterra series or memory polynomials, the complexity of the proposed concept is reduced to a feasible level, allowing for implementation in integrated circuits. Furthermore, the derived DPD model allows to use linear estimation algorithms for coefficient training. The presented DPD is demonstrated by measurements of two different capacitive RF-DAC designs and compared with conventional DPD approaches. EVM and adjacent channel power ratio (ACPR) can be improved by up to 6 and 7 dB, respectively, outperforming conventional approaches. Index Terms-Digital predistortion (DPD), memory effects, memory polynomial (MP), power amplifier (PA), radio frequency digital-to-analog converter (RF-DAC), switched-capacitor power amplifier (SCPA), Volterra series. I. INTRODUCTION T HE demand for high data rates, robust transmissions, and power efficiency poses stringent requirements on the design of integrated wireless transceiver systems. Increasing the data rate, while simultaneously providing a reliable and power-efficient transmission, is closely related to the linearity of the communication systems. In radio frequency (RF) wireless communication transmitters, the key component in terms of linearity and Manuscript

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Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%

Section: A Evaluation Setupmentioning

confidence: 99%

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