An LC bandpass &amp;#x0394;&amp;#x03A3; ADC with 70dB SNDR over 20MHz bandwidth using CMOS DACs

Harrison, J.; Nesselroth, Michal; Mamuad, Robert; Behzad, Arya; Adams, Andrew; Avery, Steve

doi:10.1109/isscc.2012.6176901

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…Over the years, more and more CT-Σ∆Ms are demonstrating to be a competitive solution for the implementation of power-efficient ADCs operating in the GHz range [74]- [76], [89]- [99]. The use of CT loop filters make more feasible the development of digital-intensive RF transceivers [100] and SDR, often referred to as Σ∆ receivers [101].…”

Section: B σ∆M-based Receivers For Sdr/crmentioning

confidence: 99%

AI-Managed Cognitive Radio Digitizers

Rosa

2022

IEEE Circuits Syst. Mag.

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Embedding Artificial Intelligence (AI) in integrated circuits is one of the technology pillars of the so-called digital transformation. Nowadays, the vast majority of electronic devices benefits from digital signal processing to implement more and more functionalities, which can be further enhanced by the action of AI algorithms and artefacts. Moreover, as the analog/digital interfaces are moving closer and closer to the point where the information is either acquired or transmitted, the so-called AImanaged data converters are becoming key building blocks in an increasingly number of interconnected cyberphysical systems -made up of both software and hardware components. Software Defined Radio (SDR) and Cognitive Radio (CR) systems intended for 5G/6G communications are good examples which can benefit from an early digitization managed by AI engines.In this context, this paper presents an overview of circuits and systems techniques for AI-managed analog/digital interfaces with application in SDR/CR mobile telecom systems. Some design trends and challenges are discussed, going from new communications and computing paradigms for AIoT devices and networks, to digital-based/scaling-friendly analog circuit techniques for an efficient digitization. The state of the art on Analogto-Digital Converters (ADCs) is surveyed, putting emphasis on highly-programmable Sigma-Delta Modulators (Σ∆Ms) as one of the best ADC candidates for SDR/CR transceivers. Some chip examples are shown to illustrate their potential application in AI-enhanced CR end-devices.

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Section: B σ∆M-based Receivers For Sdr/crmentioning

confidence: 99%

AI-Managed Cognitive Radio Digitizers

Rosa

2022

IEEE Circuits Syst. Mag.

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“…A single-bit quantizer, on the other hand, has the advantage of an ADC that is easy to drive and an inherently linear feedback DAC [11], [12]. Unfortunately, however, the rail-torail feedback DAC waveform necessitates increased loop-filter power dissipation to achieve the desired linearity.…”

Section: Introductionmentioning

confidence: 99%

On the Use of FIR Feedback in Bandpass Delta-Sigma Modulators

Gorji,

Pavan,

Rosa

2024

IEEE Trans. Circuits Syst. I

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This paper presents a new architecture for bandpass delta-sigma modulators (BP∆ΣMs) featuring finite impulse response (FIR) filters in the feedback path. The effectiveness of FIR feedback in lowpass delta-sigma modulators (LP∆ΣMs) has been well-established in improving loop-filter linearity and robustness to clock jitter. Building upon these findings, we explore the application of bandpass FIR filters in single-bit BP∆ΣMs. By contrast to conventional BP∆ΣMs, the proposed technique significantly reduces out-of-band quantization error contents in the feedback signal. This approach is applicable to both discretetime and continuous-time implementations. Further, we show that performance does not improve by increasing the number of FIR taps beyond a certain point. However, we can enhance filtering performance by employing non-equal coefficients within the filter. To validate the efficacy of the presented approach, the paper includes electrical simulation of a 4th-order active-RC BP∆ΣM.

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Time-Continuous Σ Δ Modulation

Pelgrom

2021

Analog-to-Digital Conversion

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An LC bandpass ΔΣ ADC with 70dB SNDR over 20MHz bandwidth using CMOS DACs

Cited by 12 publications

References 4 publications

AI-Managed Cognitive Radio Digitizers

AI-Managed Cognitive Radio Digitizers

On the Use of FIR Feedback in Bandpass Delta-Sigma Modulators

Time-Continuous Σ Δ Modulation

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