Modeling of an IQ RF-DAC with error-free LO-switching

Hamidović, Damir; Markovic, J.; Buckel, T.; Preyler, Peter; Huemer, Mario; Springer, Andreas

doi:10.1109/iscas.2018.8351573

Cited by 7 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional internal nonidealities arise from misalignment of the sampling instant between data and the respective LO signals or nonideal sign operation, increasing the noise floor and generating unwanted spurs in the output signal [36]. Similar effects are generated by the misalignment of the switching times caused by different lengths of the LO signal distribution into the individual cells.…”

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%

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

Trampitsch

Kalcher²,

Enzinger³

et al. 2021

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

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

show abstract

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%