OTA-Free MASH 2–2 Noise Shaping SAR ADC: System and Design Considerations

Akbari, Masoume; Honarparvar, Mohammad; Savaria, Yvon

doi:10.1109/iscas45731.2020.9180832

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Undoubtedly, the idea to achieve higher order NTFs that has recently reported more guidelines and contributions, it is NS SAR Multi-stage noise-shaping (MASH) architectures. Figure 33 shows the schematic of a MASH 2-2 without OTA [71] based on an EF structure, it has achieved a fourth-order NTF at 500 kHz BW. Similarly, other interesting works on MASH have been reported [72,73].…”

Section: Trends Further Advances and Conclusionmentioning

confidence: 99%

A Review on Fundamentals of Noise-Shaping SAR ADCs and Design Considerations

Arzate-Palma,

Rivera-Orozco,

Molina Salgado

et al. 2024

Chips

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A general overview of Noise-Shaping Successive Approximation Register (SAR) analog-to-digital converters is provided, encompassing the fundamentals, operational principles, and key architectures of Noise-Shaping SAR (NS SAR). Key challenges, including inherent errors in processing circuits, are examined, along with current advancements in architecture design. Various issues, such as loop filter optimization, implementation methods, and DAC network element mismatches, are explored, along with considerations for voltage converter performance. The design of dynamic comparators is examined, highlighting their critical role in the SAR ADC architecture. Various architectures of dynamic comparators are extensively explored, including optimization techniques, performance considerations, and emerging trends. Finally, emerging trends and future challenges in the field are discussed.

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Section: Trends Further Advances and Conclusionmentioning

confidence: 99%

A Review on Fundamentals of Noise-Shaping SAR ADCs and Design Considerations

Arzate-Palma,

Rivera-Orozco,

Molina Salgado

et al. 2024

Chips

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“…La Fig. 35 muestra el esquemático de un MASH 2-2 sin OTA [59] basado en una estructura EF que ha alcanzado una NTF de 4 to orden en un BW de 500 kHz. De igual manera, otros trabajos interesantes de MASH han sido reportados en [62,63].…”

Section: Tendencias Y Línea De Trabajo Actualunclassified

Revisión general de ADCs tipo Noise Shaping SAR: Fundamentos, retos y tendencias

Orozco¹,

Linares

Salgado

et al. 2023

Rev. Mex. Fís.

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Se presenta una introducción al estudio de los convertidores analógico-digital de aproximaciones sucesivas (SAR) tipo Noise Shaping, así como una descripción general de los fundamentos del Noise Shaping SAR (NS SAR), sus principios básicos de operación y principales arquitecturas. Se abordan los problemas abiertos, se revisan los desafíos fundamentales y las fuentes de error principales en los circuitos de procesamiento, y se resumen los desarrollos de las arquitecturas de vanguardia, que hacen frente a diversos problemas que incluye el filtro de lazo, sus implementaciones pasivas/activas, y el mismatch presente en los elementos de red del DAC, entre otros. Adicionalmente, se exponen las tendencias y retos futuros.

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“…However, tight matching between the analog and digital circuit blocks is required to combine the two stages, which poses a challenge as PVT variations can introduce mismatch and degrade SNR due to noise leakage [5]. Several combinations of NS-SAR in MASH structures have been proposed, for example two NS-SAR in a conventional MASH [7] or a pipeline MASH structure [8].…”

Section: Introductionmentioning

confidence: 99%

A Lean Noise-Cancelling Sturdy MASH Delta-Sigma ADC with a Noise-Shaping SAR Stage

Verreault,

Cicek,

Robichaud

2023

2023 30th IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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This paper introduces a lean noise-cancelling sturdy-MASH delta-sigma ADC, achieved through the implementation of a noise-shaping SAR second stage, the use of which instead of the usual delta-sigma stage, eliminates, by virtue of its inherent feedforward mechanism, the quantization noise of the first stage. Moreover, any mismatch-induced error of the noise-shaping SAR gets shaped by the first stage, circumventing the need for strict capacitor matching or calibration. The elimination of noisecancelling and/or calibration circuitry, as well as the inclusion of the area-efficient noise-shaping SAR qualify this topology as lean. Simulations demonstrate a proof-of-concept design achieving 107.7 dB SQNR for an OSR of 14 over a 1 MHz bandwidth.

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OTA-Free MASH 2–2 Noise Shaping SAR ADC: System and Design Considerations

Cited by 5 publications

References 18 publications

A Review on Fundamentals of Noise-Shaping SAR ADCs and Design Considerations

A Review on Fundamentals of Noise-Shaping SAR ADCs and Design Considerations

Revisión general de ADCs tipo Noise Shaping SAR: Fundamentos, retos y tendencias

A Lean Noise-Cancelling Sturdy MASH Delta-Sigma ADC with a Noise-Shaping SAR Stage

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