Fully-digital transmitter architectures and circuits for the next generation of wireless communications

Kalcher, Michael; Fulde, M.; Gruber, Daniel

doi:10.1007/s00502-017-0573-4

Cited by 4 publications

(5 citation statements)

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“…Long-term clock jitter and the corresponding phase noise of the LO contribute directly to the output of the RF-DAC, increasing the out-of-band noise floor [34]. Furthermore, polar and multiphase architectures rely on the dynamic (resolution) of a digital phase-locked loop (DPLL) or a digital-to-time converter (DTC) to achieve the required bandwidth of the modulated digital input signal [14], [37]. 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.…”

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%

“…For further details on the implementation and digital enhancement of capacitive RF-DACs, the reader is referred to the literature [14], [17]- [19], [21], [38], [39].…”

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%

“…The concept (9) with α[k] as proposed in (12) does not represent a perfect inversion of the RF-DAC's nonlinearity. However, the dominating distortions caused by v d [k] can be canceled, as indicated in (14).…”

Section: Supply Network Dpd For Capacitive Rf-dacsmentioning

confidence: 99%

“…Another approach to increase the system's power efficiency is to utilize the advantages of integrated circuitry based on digital building blocks [12]. One promising concept is the radio frequency digital-to-analog converter (RF-DAC), which shifts the circuit complexity for wireless transmitters further to the digital domain, reducing the number of required active and passive components [13], [14]. RF-DACs combine the functionality of a DAC and an upconversion mixer in a single circuit, allowing an efficient implementation on a monolithic die and leveraging the benefits of scaled CMOS technology with increased usage of fast and programmable digital blocks.…”

mentioning

confidence: 99%

“…RF-DACs combine the functionality of a DAC and an upconversion mixer in a single circuit, allowing an efficient implementation on a monolithic die and leveraging the benefits of scaled CMOS technology with increased usage of fast and programmable digital blocks. RF-DACs have gained an increasing amount of interest in the Wireless Communications Society [14]- [18].…”

mentioning

confidence: 99%

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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%

“…For further details on the implementation and digital enhancement of capacitive RF-DACs, the reader is referred to the literature [14], [17]- [19], [21], [38], [39].…”

Section: A Nonidealities Of Capacitive Rf-dacsmentioning

confidence: 99%