Delta–Sigma Encoder for Low-Power Wireless Bio-Sensors Using Ultrawideband Impulse Radio

Tang, Xiaochen; Hu, Qisong; Tang, Wei

doi:10.1109/tcsii.2016.2601062

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…2, where a current signal g c e 2 is injected into the e 2 node. Using (2), and indicating withē 3 the compensated circuit output, the transfer function can be approximated as: with a high-frequency positive real zero with ω z = g m /C and two negative real poles with:…”

Section: B Compensating the Limited DC Gainmentioning

confidence: 99%

“…Another influential feature is the low quantization levels that make these modulators attractive for signal processing. As an example, other recent publications show important benefits for ultra wide-band communications with single-bit CT encoded streams [2]. The main reason is that a single-bit architecture allows using, in the feedback loop, a simple comparator and a digital buffer as Digital-to-Analog converter (DAC) and ADC, respectively, thus reducing the delay in the loop.…”

Section: Introductionmentioning

confidence: 99%

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A 65nm Continuous-Time Sigma-Delta Modulator With Limited OTA DC Gain Compensation

González-Díaz

Pareschi

2020

IEEE Access

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This paper explores the effects of compensating the performance degradation in high-speed Continuous-Time Sigma-Delta modulators when the loop integrators are implemented through limited gain Operational Transconductance Amplifiers. Yet, the low DC-gain strongly affects both integrator magnitude and phase responses, with a reduction in the overall effective number of bits. This work models the degradation as due to a signal-dependent memory-less perturbation and theoretically studies its compensation by feeding an opposite signal back to the integrator input. The implementation and experimental results on a 65nm CMOS 2nd order prototype evaluate the performance increase with this technique, where no other compensation, nor any digital calibration, is included. Tested in different conditions, the compensated prototype improves more than 1.5 bit the ENoB with respect to the uncompensated counterpart. For a sampling frequency of 500 MHz the power consumption is 1.7mW, resulting in a 477.2fJ/conv-lev Walden and a 148.8dB Schreirer Figures of Merit.

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Section: B Compensating the Limited DC Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 65nm Continuous-Time Sigma-Delta Modulator With Limited OTA DC Gain Compensation

González-Díaz

Pareschi

2020

IEEE Access

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“…Another issue is that commercially available solutions are usually confinement setups, which are not easy for remote grazing sites and not able to be used for monitoring wild animals. Based on the design constraints, biological sensing and data acquisition systems [ 22 , 23 , 24 , 25 ] would take an important role in developing an integrated water monitoring system by combining low-cost sensors, embedded systems, and data communication or storage devices [ 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. Such devices are expected to be deployed in the remote ranching sites to track the water intake and watering behavior of both livestock and wildlife.…”

Section: Introductionmentioning

confidence: 99%

A Smart Sensing System of Water Quality and Intake Monitoring for Livestock and Wild Animals

Tang

Biglari

Ebarb

et al. 2021

Sensors

Self Cite

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This paper presents a water intake monitoring system for animal agriculture that tracks individual animal watering behavior, water quality, and water consumption. The system is deployed in an outdoor environment to reach remote areas. The proposed system integrates motion detectors, cameras, water level sensors, flow meters, Radio-Frequency Identification (RFID) systems, and water temperature sensors. The data collection and control are performed using Arduino microcontrollers with custom-designed circuit boards. The data associated with each drinking event are water consumption, water temperature, drinking duration, animal identification, and pictures. The data and pictures are automatically stored on Secure Digital (SD) cards. The prototypes are deployed in a remote grazing site located in Tucumcari, New Mexico, USA. The system can be used to perform water consumption and watering behavior studies of both domestic animals and wild animals. The current system automatically records the drinking behavior of 29 cows in a two-week duration in the remote ranch.

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“…In particular, the binary quantizers including delta modulators (

-Ms) and delta sigma modulators (

-Ms) are widely utilized in power conversions for their implementation simplicity [ 3 , 4 ], networked and quantized control systems for their low-data rate [ 5 , 6 ], and as typical complex systems for their high nonlinearity, periodicity and robustness at the same time [ 7 , 8 ]. Such systems are often used as coding mechanism in many applications such bio-medical engineering (see [ 9 , 10 ]) due to their low energy consumption and ability in data compression and for reducing the wiring in communication systems where the communication channels are shared by many entities and hardware resources are limited [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

The Complex Adaptive Delta-Modulator in Sliding Mode Theory

Almakhles

2020

Entropy

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In this paper, we consider the stability and various dynamical behaviors of both discrete-time delta modulator (Δ-M) and adaptive Δ-M. The stability constraints and conditions of Δ-M and adaptive Δ-M are derived following the theory of quasi-sliding mode. Furthermore, the periodic behaviors are explored for both the systems with steady-state inputs and certain parameter values. The results derived in this paper are validated using simulated examples which confirms the derived stability conditions and the existence of periodicity.

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Delta–Sigma Encoder for Low-Power Wireless Bio-Sensors Using Ultrawideband Impulse Radio

Cited by 18 publications

References 11 publications

A 65nm Continuous-Time Sigma-Delta Modulator With Limited OTA DC Gain Compensation

A 65nm Continuous-Time Sigma-Delta Modulator With Limited OTA DC Gain Compensation

A Smart Sensing System of Water Quality and Intake Monitoring for Livestock and Wild Animals

The Complex Adaptive Delta-Modulator in Sliding Mode Theory

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