Segmented mismatch-shaping D/A conversion

Fishov, Alexander; Siragusa, E.; Welz, J.; Fogleman, E.; Galton, I.

doi:10.1109/iscas.2002.1010547

Cited by 18 publications

(7 citation statements)

References 3 publications

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“…Instead, they digitize just the signal band, thereby requiring much lower power consumption to obtain a given DR [25], [63]. In addition, IF A/D conversion allows a great part of the signal processing to be moved from the analog 12 The interested reader can find a detailed explanation of these algorithms in a number of papers and books [46]- [52]. domain to the digital domain, including: quadrature mixing, channel selection, gain control, and demodulation.…”

Section: Bandpass Msmentioning

confidence: 99%

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Sigma-Delta Modulators: Tutorial Overview, Design Guide, and State-of-the-Art Survey

Rosa

2011

IEEE Trans. Circuits Syst. I

195

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Section: Bandpass Msmentioning

confidence: 99%

“…• Taxonomy of Ms: Basic (DT) Ms [35], [38], [39]; multibit quantization and linearization techniques [44]- [52], [54]- [58]; BPMs [59]- [63], [71], [73], [74]; CTMs [53], [66], [67], [69], [136]. • Circuit implementation and nonideal performance: [27], [78]- [80], [82]- [97].…”

Section: References (Organized By Topics)mentioning

confidence: 99%

Sigma-Delta Modulators: Tutorial Overview, Design Guide, and State-of-the-Art Survey

Rosa

2011

IEEE Trans. Circuits Syst. I

195

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“…They are only summarized on table-II; one can refer to the related references. Between proposed tones prevention methods, the partitioned technique (PDWA) is more attractive because of its relatively better performance, simplicity and generality for lowpass and bandpass applications [8,9,12,12]. Fig.4 shows PDWA architecture, where DAC input code is divided into two parts using a simple divider and adding rest of division on only one definitive part of the results.…”

Section: Prevention Of Tonal Behaviour Of Dwamentioning

confidence: 99%

Completely first order and tone free partitioned data weighted averaging technique used in a multibit delta sigma modulator

Aghdam

Bénabès

Javad

2009

2009 European Conference on Circuit Theory and Design

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In order to reduce mismatch error of a DAC used in a multibit delta-sigma some dynamic element matching (DEM) algorithms have been proposed before, from which Data-Weighted-Averaging (DWA) method is more hardware efficient and widely used. Unfortunately, DWA technique loses its functionalities for periodic signals which cannot be practically avoided. Many improvements have been suggested to minimize in band tone generated by DWA algorithm, but they cause limited performance compared with an ideal first order DEM. This paper presents a new modified DWA structure, which results in a completely first order mismatch noise shaping while solving in band tone problem. Simulations are presented for a 3rd-order lowpass delta sigma. However, its modified version can also be used in bandpass applications.

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“…The latter is not an issue if we use a segmented tree architecture [2], which might be implemented by ( ) digital switching blocks. Even though the comparator speed requirement decreases with , for a given bandwidth and resolution, the ADC size, with its exponential [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Reducing the Number of Comparators in Multibt $\Delta \Sigma $ Modulators

Pesenti¹,

Clement²,

Kayal

2008

IEEE Trans. Circuits Syst. I

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Multibit feedback, being one way of lowering 16 modulators power consumption, has a major obstacle: the number of components in the internal analog-to-digital converter (ADC) and digital-to-analog converter (DAC). Nevertheless, the number of comparators in the ADC can be significantly reduced depending on the order of noise-shaping and the oversampling ratio. In this paper, we propose an auto-ranging algorithm with a mechanism to keep the structure stable that emulates more quantization levels than that allowed by the number of comparators. As the recourse to segmented DACs allows lowering the complexity of the mismatch shaping encoder, the auto-ranging ADC brings the benefits of multibit feedback without the usual increase in size and power consumption. The internal number of bits in 16 16 16 modulators is no more restricted by the difficulty of building the flash ADC with a low voltage supply.Index Terms-Adaptive algorithm, auto-ranging, delta-sigma (16), dynamic element matching (DEM), low voltage, multibit.

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Segmented mismatch-shaping D/A conversion

Cited by 18 publications

References 3 publications

Sigma-Delta Modulators: Tutorial Overview, Design Guide, and State-of-the-Art Survey

Sigma-Delta Modulators: Tutorial Overview, Design Guide, and State-of-the-Art Survey

Completely first order and tone free partitioned data weighted averaging technique used in a multibit delta sigma modulator

Reducing the Number of Comparators in Multibt $\Delta \Sigma $ Modulators

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