Power Efficient ADCs for Biomedical Signal Acquisition

Rodríguez-Pérez, Alberto; Delgado‐Restituto, Manuel; Medeiro, F.

doi:10.5772/13070

Cited by 9 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several works have employed diferent and unusual implementation techniques for SAR DAC. In order to get rid of the parasitic capacitance efect, work [62][63][64] employs the charge-sharing scheme and a switched capacitor (SC) integrator, as shown in Figure 23. Te execution of the operation takes place…”

Section: Capacitive Dac Array (Cdac)mentioning

confidence: 99%

Successive Approximation Register Analog-to-Digital Converter (SAR ADC) for Biomedical Applications

Arafa

Ellaithy

Zekry

et al. 2023

Active and Passive Electronic Components

View full text Add to dashboard Cite

This study presents a survey of the most promising reported SAR ADC designs for biomedical applications, stressing advantages, disadvantages, and limitations, and concludes with a quantitative comparison. Recent progress in the development of a single SAR ADC architecture is reviewed. In wearable and biosensor systems, a very small amount of total power must be devoured by portable batteries or energy-harvesting circuits in order to function correctly. During the past decade, implementation of the high energy efficiency of SAR ADC has become the most necessary. So, several different implementation schemes for the main components of the SAR ADC have been proposed. In this review study, the various circuit architectures have been explained, beginning with the sample and hold (S/H) switching circuits, the dynamic comparator, the internal digital-to-analog converter (DAC), and the SAR control logic. In order to achieve low power consumption, numerous different configurations of dynamic comparator circuits are revealed. At the end of this overview, the evolutions of DAC architecture in distinct biomedical applications today can make a tradeoff between resolution, speed, and linearity, which represent the challenges of a single SAR ADC. For high resolution, the dual split capacitive DAC (CDAC) array technique and hybrid capacitor technique can be used. Also, for ultralow power consumption, various voltage switching schemes are achieved to reduce the number of switches. These schemes can save switching energy and reduce capacitor array area with high linearity. Additionally, to increase the speed of the conversion process, a prediction-based ADC design is employed. Therefore, SAR ADC is considered the ideal solution for biomedical applications.

show abstract

Section: Capacitive Dac Array (Cdac)mentioning

confidence: 99%

Successive Approximation Register Analog-to-Digital Converter (SAR ADC) for Biomedical Applications

Arafa

Ellaithy

Zekry

et al. 2023

Active and Passive Electronic Components

View full text Add to dashboard Cite

show abstract

“…10b implementations are shown in Fig. 1 [4]. State-of-the-art SAR ADC designs favour binary-weighted DACs over the split-capacitor DACs in-spite of binary DACs requiring significantly larger number of unit elements as compared to the split-capacitor DACs, for example: as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Capacitive DAC Architectures for Power and Area Efficient SAR ADC Designs

Ahuja

Badami

Barbelenet³

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

View full text Add to dashboard Cite

This paper presents a detailed comparison between the two commonly used capacitive DAC architectures for 10-bit SAR ADCs: binary-weighted and split-capacitor DACs. These DAC architectures are compared based on the impact of unitcapacitor mismatch and parasitic capacitance on their linearity, area and power consumption. The split-capacitor DAC is shown to be much more sensitive to unit-capacitor mismatch and parasitic capacitances as opposed to the binary-weighted DACs. Unit-capacitor values are then calculated for the split-capacitor and binary-weighted DAC topologies under two orthogonal scenarios: (a) Fixed linearity at the expense of the area and power consumption and (b) Maximizing the linearity within a specified area budget. In-spite of requiring significantly lower number of unit elements as compared to a binary-weighted DAC, split-capacitor DAC yields a larger value of unit-capacitor and total DAC capacitance for fixed linearity scenario and conversely results in a lower effective number of bits (ENOB) for a fixed area specification. Based on our analysis, binary DAC is found to be more area and power efficient than its split capacitor counterpart.

show abstract

“…The ADC is one of the key building blocks, which enables converting analog signals from biomedical sensors to a digital format that can be easily processed and analyzed. For the design of the ADC, many authors choose the SARarchitecture due to its suitability for low-power and low-voltage requirements [ 8 , 9 , 10 , 11 ]. Recently, delta-sigma (

) ADC has been gaining more and more popularity.…”

Section: Introductionmentioning

confidence: 99%

A 1 V 92 dB SNDR 10 kHz Bandwidth Second-Order Asynchronous Delta-Sigma Modulator for Biomedical Signal Processing

Kledrowetz

Fujcik

Prokop

et al. 2020

Sensors

View full text Add to dashboard Cite

In this paper, a second-order asynchronous delta-sigma modulator (ADSM) is proposed based on the active-RCintegrators. The ADSM is implemented in the 0.18 μ m CMOS Logic or Mixed-Signal/RF, General Purpose process from the Taiwan Semiconductor Manufacturing Company with a center frequency of 848 kHz at a supply voltage of 1 V with a 92 dB peak signal-to-noise and distortion ratio ( S N D R ), which corresponds to 15 bit resolution. These parameters were achieved in all the endogenous bioelectric signals bandwidth of 10 kHz. The ADSM dissipated 295 μ W and had an area of 0.54 mm 2 . The proposed ADSM with a high resolution, wide bandwidth, and rail-to-rail input voltage range provides the universal solution for endogenous bioelectric signal processing.

show abstract

Power Efficient ADCs for Biomedical Signal Acquisition

Cited by 9 publications

References 23 publications

Successive Approximation Register Analog-to-Digital Converter (SAR ADC) for Biomedical Applications

Successive Approximation Register Analog-to-Digital Converter (SAR ADC) for Biomedical Applications

Comparison of Capacitive DAC Architectures for Power and Area Efficient SAR ADC Designs

A 1 V 92 dB SNDR 10 kHz Bandwidth Second-Order Asynchronous Delta-Sigma Modulator for Biomedical Signal Processing

Contact Info

Product

Resources

About