A Comparative Analysis of Parallel Delta–Sigma ADC Architectures

Eshraghi, A.; Fiez, T.S.

doi:10.1109/tcsi.2004.823663

Cited by 38 publications

(37 citation statements)

References 16 publications

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“…The TI concept depends on the idea of the perfect cancellation of the signal images created by the downsampling process [5][6][7]. However, the quantization tones' images and the input signal images produced by downsampling cannot be cancelled perfectly due to the finite wordlength of the internal paths.…”

Section: Quantization Tones In Ti  Modulatorsmentioning

confidence: 99%

“…They employ relatively simple hardware in combination with oversampling and noise-shaping to acquire high resolution [3], [4]. However, conventional discrete-time and digital single-stage  modulators are mostly limited to narrowband signal applications due to their high oversampling requirements [3][4][5][6]. On the other hand, emerging technologies such as GSM, GNSS, CDMA, DECT have accelerated the need for designers to implement Σ-∆ modulators that have extended bandwidths while also maintaining relatively relaxed OverSampling Ratios OSRs [1], [2], [7].…”

Section: Introductionmentioning

confidence: 99%

“…A further advantage of the TI approach is that it offers an elegant means to increase the signal bandwidth for both A/D and D/A applications without the need to use faster or higher-order  modulators [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…There are several behavioural-and circuit-level TI  modulator topologies reported in the open literature but to the best knowledge of the authors, all these topologies have concentrated on LowPass (LP) and mid-band resonator based  modulators [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design and implementation of novel FPGA based time-interleaved variable centre-frequency digital Î£âˆ’Î” modulators

2015

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Multiresolution analog-to-digital converters (MRADC) are usually used in Time Domain ElectroMagnetic Interference (TDEMI) measuring systems for very fast signal sampling with a sufficient dynamic range. The properties of the spectrum measured by the TDEMI system influenced by imperfections in the MRADC are analyzed in this paper. Errors are caused by imperfect matching of the offset and gain and phase of the circuits used in parallel input channels typical for the MRADC. For deep analyses of MRADC behavior, a precise mathematical model has been created using the concept of additive error pulses. Furthermore, a dedicated process of the identification of discrepancy parameters from experimental data is proposed. Identified parameters enter the expressions of the model and enable side to side comparison of experimental and theoretical results.Novel, multi-path, time-interleaved digital sigma-delta modulators that can operate at any arbitrary frequency from DC to Nyquist are designed, analysed and synthesized in this study. Dual- and quadruple-path fourth-order Butterworth, Chebyshev, Inverse Chebyshev and Elliptical based digital sigma-delta modulators, which offer designers the flexibility of specifying the centre-frequency, pass-band/stop-band attenuation as well as the signal bandwidth are presented. These topologies are compared in terms of their signal-to-noise ratios, hardware complexity, stability, tonality and sensitivity to non-idealities. Detailed simulations performed at the behavioural-level in MATLAB are compared with the experimental results of the FPGA implementation of the designed modulators. The signal-to-noise ratios between the simulated and empirical results are shown to be different by not more than 3-5 dBs. Furthermore, this paper presents the mathematical modelling and evaluation of the tones caused by the finite wordlengths of these digital multi-path sigma-delta modulators when excited by sinusoidal input signals.

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Section: Quantization Tones In Ti  Modulatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and implementation of novel FPGA based time-interleaved variable centre-frequency digital Î£âˆ’Î” modulators

2015

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“…The Frequency-Band-Decomposition (FBD) [1], [2], [3] is a natural way to widen the bandwidth of sigma-delta converters [4], using parallel bandpass modulators, where each modulator processes a part of the band of the input signal [5]. The main issue of this process is its sensitivity to the central frequencies of the bandpass modulators.…”

Section: Introductionmentioning

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.

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Two Classes of Cosine-Modulated IIR/IIR and IIR/FIR NPR Filter Banks

Rosenbaum

Lowenborg

Johansson

2009

Circuits Syst Signal Process

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This paper introduces two classes of cosine-modulated causal and stable filter banks (FBs) with near perfect reconstruction (NPR) and low implementation complexity. Both classes have the same infinite-length impulse response (IIR) analysis FB but different synthesis FBs utilizing IIR and finite-length impulse response (FIR) filters, respectively. The two classes are preferable for different types of specifications. The IIR/FIR FBs are preferred if small phase errors relative to the magnitude error are desired, and vice versa. The paper provides systematic design procedures so that PR can be approximated as closely as desired. It is demonstrated through several examples that the proposed FB classes, depending on the specification, can have a lower implementation complexity compared to existing FIR and IIR cosinemodulated FBs (CMFBs). The price to pay for the reduced complexity is generally an increased delay. Furthermore, two additional attractive features of the proposed FBs are that they are asymmetric in the sense that one of the analysis and synthesis banks has a lower computational complexity compared to the other, which can be beneficial in some applications, and that the number of distinct coefficients is small, which facilitates the design of FBs with large numbers of channels.

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A Comparative Analysis of Parallel Delta–Sigma ADC Architectures

Cited by 38 publications

References 16 publications

Design and implementation of novel FPGA based time-interleaved variable centre-frequency digital Î£âˆ’Î” modulators

Design and implementation of novel FPGA based time-interleaved variable centre-frequency digital Î£âˆ’Î” modulators

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

Two Classes of Cosine-Modulated IIR/IIR and IIR/FIR NPR Filter Banks

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