Low-power low-voltage CMOS A/D sigma-delta modulator for bio-potential signals driven by a single-phase scheme

Goes, J.; Paulino, Nuno; Pinto, H. Sofia; Monteiro, Rui; Vaz, B.; Steiger-Garção, Adolfo

doi:10.1109/tcsi.2005.857552

Cited by 26 publications

(20 citation statements)

References 7 publications

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“…The voltage and frequency ranges of some common biomedical signals are shown in Fig. 1 [1]. These biomedical signals are low frequency signals.…”

Section: In Biomedical Instrumentation Biomedical Signals Such As Elmentioning

confidence: 99%

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Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

Patluri¹,

A.K²,

Dasgupta³

2008

Int. Jour. Intel. Elec. Sys.

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Key words:A low power second order sigma-delta modulator (ÓÄM), for biomedical applications, has been presented in this paper. This can be used to digitize electrical biomedical signals like , , and Electroretinogram (ERG). The proposed sigma delta modulator has been implemented by Switched Capacitor (SC) technique. Behavioral modeling of nonideal second order SC ÓÄM was done to find out the integrator's opamp specifications to attain resolution of 10 bits. Integrator has been designed to minimize distortion and charge injection, and remove input dependent offset voltage. Dynamic latched comparator has been employed for power reduction. The feedback circuit has been designed for minimum usage of switches and capacitors. The simulated results of the proposed ÓÄM in standard CMOS 0.18 µm technology, using Tanner tools gives > 10 bits resolution and power consumption ranges from 50 µW to 400 µW with a 1.8 V power supply.Biomedical application, SD Toolbox, Second Order Sigma-delta modulator. Electro-cardiogram (ECG) Electroencephalogram (EEG)

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“…The voltage and frequency ranges of some common biomedical signals are shown in Fig. 1 [1]. These biomedical signals are low frequency signals.…”

Section: In Biomedical Instrumentation Biomedical Signals Such As Elmentioning

confidence: 99%

“…Bio-potential Signals [1] In section II the behavioral modeling of ÓÄM has been presented. Section III discusses the circuit topologies for the design of low power low pass second order switched capacitor ÓÄM to achieve a resolution > 10 bits suitable to digitize biomedical signals such as ECG.…”

Section: Fig1 Voltages and Frequency Ranges Of Some Commonmentioning

confidence: 99%

Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

Patluri¹,

A.K²,

Dasgupta³

2008

Int. Jour. Intel. Elec. Sys.

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“…There has been detailed discussion about the use of oversampling in biopotential detection [1,7,8]. This technology is implemented in Labview and used in the new ECG acquisition system to improve the signalto-noise ratio of ECG.…”

Section: Introductionmentioning

confidence: 99%

An oversampling system for ECG acquisition

Zhou¹

2009

JBiSE

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Traditional ECG acquisition system lacks for flexibility. To improve the flexibility of ECG acquisition system and the signal-to-noise ratio of ECG, a new ECG acquisition system was designed based on DAQ card and Labview and oversampling was implemented in Labview. And analog signal conditioning circuit was improved on. The result indicated that the system could detect ECG signal accurately with high signal-to-noise ratio and the signal processing methods could be adjusted easily. So the new system can satisfy many kinds of ECG acquisition. It is a flexible experiment platform for exploring new ECG acquisition methods.

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“…Different bio-potential signals, such as electrooculogram (EOG), electroencephalogram (EEG), electrocardiogram (ECG), electromyogram (EMG), and axon action potential (AAP), may cover distinct portions of the spectrum and signal bandwidths (BWs) ranging from near dc to about 10 kHz [1]. To become portable or implantable, the signal processing systems targeting at these biomedical sensor applications must dissipate low power and operate at low supply voltage [1]- [2].…”

Section: Introductionmentioning

confidence: 99%

“…To become portable or implantable, the signal processing systems targeting at these biomedical sensor applications must dissipate low power and operate at low supply voltage [1]- [2]. Low-voltage operation induces critical switch problem which inhibits the utilization of conventional switched-capacitor (SC) circuit configuration.…”

Section: Introductionmentioning

confidence: 99%

A 0.7-V 10-bit 3μW analog-to-digital converter for implantable biomedical applications

Chen

Liu

2006

2006 IEEE Biomedical Circuits and Systems Conference

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For implantable biosensor applications which require a low-cost signal processing unit that features ultra-low power and low-voltage capability as well, this paper proposes a solution by merging switched-opamp technique and foreground digital calibration into a single 10-bit ADC. Utilization of the switched-opamp technique allows for low supply operation down to 0.7 V. The insufficient gain associated with low supply voltage analog devices is manipulated by the employment of foreground calibration. Ultra-low power consumption is achieved through adequate circuit structure selection and weak-inversion transistor biasing. The ADC employs the cyclic/algorithmic architecture which uses only two opamps and two comparators. Simulation results with CMOS 0.13 µm process model demonstrate that the signal to noise and distortion ratio (SNDR) at 10-KHz clock rate is 57 dB when 0.5 % capacitor mismatch is considered. The power consumption of the whole ADC is 3 µW with 0.7 V supply.

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Low-power low-voltage CMOS A/D sigma-delta modulator for bio-potential signals driven by a single-phase scheme

Cited by 26 publications

References 7 publications

Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

An oversampling system for ECG acquisition

A 0.7-V 10-bit 3μW analog-to-digital converter for implantable biomedical applications

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Low-power low-voltage CMOS A/D sigma-delta modulator for bio-potential signals driven by a single-phase scheme

Cited by 26 publications

References 7 publications

Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

Sigma Delta Modulator for Biomedical Applications With Reduced Nonidealities

An oversampling system for ECG acquisition

A 0.7-V 10-bit 3&#x03BC;W analog-to-digital converter for implantable biomedical applications

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Product

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A 0.7-V 10-bit 3μW analog-to-digital converter for implantable biomedical applications