0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems

Beriain, Andoni; Gutiérrez, I.; Solar, Héctor; Berenguer, Roc

doi:10.3390/s150921554

Cited by 8 publications

(9 citation statements)

References 10 publications

(15 reference statements)

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“…In this paper, the ratiometric concept is applied to achieve robustness to component and power supply variations without increasing complexity and without the use of bandgap circuits. The ratiometric approach is a common technique for measuring analog signals from sensors, to be conditioned in a digital signal to be compatible with a computer, DAQ system, microcontroller or microprocessor [23][24][25][26]. The advantage of the ratiometric approach is that it avoids the need for internal regulators, which reduces energy consumption and costs, but one disadvantage is that the dynamic range of the output depends on the supply voltage, and would be a major problem where the supply voltage decreases continuously, e.g., in autonomous portable equipment.…”

Section: Introductionmentioning

confidence: 99%

A Highly Robust Interface Circuit for Resistive Sensors

et al. 2019

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The signal from a resistive sensor must be converted into a digital signal to be compatible with a computer through an interface circuit. Resistance-to-Period converter, used as interface, is preferred if the resistance variations are very large. This paper presents the structure of an interface circuit for resistive sensors that is highly robust to component and power supply variations. Robustness is achieved by using the ratiometric approach, thus complex circuits or highly accurate voltage references are not necessary. To validate the proposed approach, a prototype was implemented using discrete components. Measurements were carried out considering a variation of ±35% in the single supply voltage and a range from 1 k Ω to 1 M Ω .

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Section: Introductionmentioning

confidence: 99%

A Highly Robust Interface Circuit for Resistive Sensors

et al. 2019

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“…It is important to mention the methods that combine analog and digital ways of signal processing for capacitance sensor interfaces [25,26,27,28,29]. The method proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Principle of the capacitance measurement, based on a pressure sensor, is described in Ref. [28]. This method modifies the principle that was previously presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface

Polák

Šotner

Petržela

et al. 2018

Sensors

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This paper presents a simple relaxation generator, suitable for a sensor interface, operating as a transducer of capacitance to frequency/period. The proposed circuit employs a current feedback operational amplifier, fabricated in I3T25 0.35 μm ON Semiconductor CMOS process, and four passive elements including a grounded capacitor (the sensed parameter). It offers a low-impedance voltage output of the generated square wave. Additional frequency to DC voltage converter offers output information in the form of voltage. The experimental capacitance variation from 6.8 nF to 100 nF yields voltage change in the range from 21 mV to 106 mV with error below 5% and sensitivity 0.912 mV/nF evaluated over the full range of change. These values are in good agreement with simulation results obtained from the Mathcad model of frequency to DC voltage transducer passive circuit.

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“…Thus, instruments based on optical effect are not suitable for portable measurement. The electric field measurement instruments based on capacitive sensing—a type of electromagnetic induction—are more widely used in power system environmental measurement because of their convenient manufacture, high accuracy, and strong overload capacity [ 11 , 12 , 13 ]. Therefore, an electric field sensor based on electromagnetic induction is discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

A Power-Frequency Electric Field Sensor for Portable Measurement

Xiao

Zheng

et al. 2018

Sensors

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In this paper, a new type of electric field sensor is proposed for the health and safety protection of inspection staff in high-voltage environments. Compared with the traditional power frequency electric field measurement instruments, the portable instrument has some special performance requirements and, thus, a new kind of double spherical shell sensor is presented. First, the mathematical relationships between the induced voltage of the sensor, the output voltage of the measurement circuit, and the original electric field in free space are deduced theoretically. These equations show the principle of the proposed sensor to measure the electric field and the effect factors of the measurement. Next, the characteristics of the sensor are analyzed through simulation. The simulation results are in good agreement with the theoretical analysis. The influencing rules of the size and material of the sensor on the measurement results are summarized. Then, the proposed sensor and the matching measurement system are used in a physical experiment. After calibration, the error of the measurement system is discussed. Lastly, the directional characteristic of the proposed sensor is experimentally tested.

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0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems

Cited by 8 publications

References 10 publications

A Highly Robust Interface Circuit for Resistive Sensors

A Highly Robust Interface Circuit for Resistive Sensors

CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface

A Power-Frequency Electric Field Sensor for Portable Measurement

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