Optimization of the noise transfer function of Extended-Frequency-Band-Decomposition sigma-delta A/D converters

Beydoun,; Benabes,; Oksman,

doi:10.1109/newcas.2008.4606354

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…In order to reduce the requirement of high clock speed in some parts of the signal processing units, different parallel processing techniques have been introduced, including frequency band decomposition (FBD) [19], Hadamard transformer-based approach [20], [21], and the timeinterleaving (TI) techniques [22], [23], [24], [25].…”

Section: B Parallel Branches Based Dsmsmentioning

confidence: 99%

Parallel Delta-Sigma Modulator-Based Digital Predistortion of Wideband RF Power Amplifiers

Othmani

Boulejfen

Turunen

et al. 2023

IEEE Trans. Circuits Syst. I

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In this article, we propose a new robust and highly efficient digital predistortion (DPD) concept for the linearization of wideband RF power amplifiers (PAs). The proposed approach is based on the combination of a parallelized delta-sigma modulator (DSM) and a forward model of the PA. This concept applies multi-rate techniques on a DSM that incorporates the forward PA model in its feedback loop to perform the required signal predistortion. Such a technique eliminates the need of reverse modeling and its associated problems. The multi-rate approach relaxes enormously the clock speed requirement of the DPD, which allows handling high signal bandwidths at feasible sampling rates. Moreover, enhanced performance can be achieved without the need of increasing the order of the modulator which reduces the sensitivity of the system to gain variations and phase distortions caused by the nonlinear PA characteristics. Three time-interleaved parallel DPD (P-DPD) variants are described and introduced, all of them have been shown to offer increased accuracy, and consequently better linearization performance compared to the DSM-based DPD state-of-the-art. The proposed architectures are tested and assessed using extensive real-world RF measurements at the 3.6 GHz band utilizing wideband 100 MHz 5G New Radio (NR) transmit waveforms, evidencing excellent transmit signal quality.

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Section: B Parallel Branches Based Dsmsmentioning

confidence: 99%

Parallel Delta-Sigma Modulator-Based Digital Predistortion of Wideband RF Power Amplifiers

Othmani

Boulejfen

Turunen

et al. 2023

IEEE Trans. Circuits Syst. I

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“…1) . The proposed algorithm is based on a so-called relaxation method [18]. It does not require any operations except the calculation of the output power.…”

Section: Noise Transfer Function Calibration Algorithmmentioning

confidence: 99%

Extended frequency-band-decomposition sigma–delta A/D converter

Bénabès

Beydoun

Oksman

2009

Analog Integr Circ Sig Process

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Frequency-Band-Decomposition (FBD) is a good candidate to be used to increase the bandwidths of ADC converters based on sigma-delta modulators for software and cognitive radio applications where we need to convert wide bandwidths. Each modulator processes a part of the band of the input signal which is then passed through a digital filter. In the case of large mismatches in the analog modulators, a new solution, called Extended Frequency-Band-Decomposition (EFBD) can be used. As an example, this solution can allow for a 4 % error in the central frequencies without significant degradation of its performance when the digital processing part is paired with the analog modulators. A calibration of the digital part is thus required to reach these theoretical performances. This paper will focus on a self-calibration algorithm for an EFBD. The algorithm helps minimize the quantization noise of the EFBD and helps to flatten the signal transfer function.

show abstract

“…The proposed algorithm is based on a so-called relaxation method [18]. It does not require any operations except the calculation of the output power.…”

Section: Noise Transfer Function Calibration Algorithmmentioning

confidence: 99%

A self-calibration scheme for extended frequency-band-decomposition sigma-delta ADC

Bénabès

Beydoun

2009

Analog Integr Circ Sig Process

Self Cite

View full text Add to dashboard Cite

Frequency-band-decomposition (FBD) is a good candidate to be used to increase the bandwidths of ADC converters based on sigma-delta modulators for software and cognitive radio applications where we need to convert wide bandwidths. Each modulator processes a part of the band of the input signal which is then passed through a digital filter. In the case of large mismatches in the analog modulators, a new solution, called extended frequencyband-decomposition (EFBD) can be used. As an example, this solution can allow for a 4% error in the central frequencies without significant degradation of its performance when the digital processing part is paired with the analog modulators. A calibration of the digital part is thus required to reach these theoretical performances. This paper will focus on a self-calibration algorithm for an EFBD. The algorithm helps minimize the quantization noise of the EFBD and helps to flatten the signal transfer function.

show abstract

Optimization of the noise transfer function of Extended-Frequency-Band-Decomposition sigma-delta A/D converters

Cited by 3 publications

References 12 publications

Parallel Delta-Sigma Modulator-Based Digital Predistortion of Wideband RF Power Amplifiers

Parallel Delta-Sigma Modulator-Based Digital Predistortion of Wideband RF Power Amplifiers

Extended frequency-band-decomposition sigma–delta A/D converter

A self-calibration scheme for extended frequency-band-decomposition sigma-delta ADC

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