A low-power capacitance measurement circuit with high resolution and high degree of linearity

Haider, Mohammad Rafiqul; Mahfouz, Mohamed R.; Islam, Syed K.; Eliza, Sazia A.; Qu, Wenchao; Pritchard, Emily

doi:10.1109/mwscas.2008.4616786

Cited by 30 publications

(21 citation statements)

References 6 publications

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“…Assume or The equations then become: (18) Using the inverse Laplace transform, the function , in time domain, can be retrieved: (19) where and are transient and steady state parts of respectively.…”

Section: Discussionmentioning

confidence: 99%

Weakly-Coupled Resonators in Capacitive Readout Circuits

Hafizi-Moori

Cretu

2015

IEEE Trans. Circuits Syst. I

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Low energy consumption and wide operating temperature range of capacitors made them common in sensor designs, e.g., MEMS accelerometers, and hence increased the popularity of capacitive readout circuits. Their main challenges, in either discrete or integrated implementations, are sensitivity, noise, energy consumption, and parasitic components at the analog front end. Compared to conventional "frequency-shift monitoring" which is one of the most accurate and common methods for capacitance measurements, weakly-coupled resonators (well-known in mechanical systems) can offer up to three orders of magnitude increase in sensitivity. Therefore, this concept has been recently applied to the design of micromechanical sensors, e.g., for sensitive mass sensing. This paper applies, for the first time in the electrical domain, the concept of monitoring the eigenstates variations in weakly-coupled resonators as a generic readout circuit technique for measuring very small capacitance changes. The outstanding sensitivity of this method is verified analytically and demonstrated using both extensive circuit simulations and experimental measurements.

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Section: Discussionmentioning

confidence: 99%

Weakly-Coupled Resonators in Capacitive Readout Circuits

Hafizi-Moori

Cretu

2015

IEEE Trans. Circuits Syst. I

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“…On the basis of literature research, a state-of-art and a novel measurement circuit were developed [10][11]. As conclusion of this study a conventional bridge measurement [12][13] method has been chosen for the first technology demonstrator. The block diagram demonstrating the operation principle is shown in Fig.…”

Section: Measurement Methods and Circuitmentioning

confidence: 99%

A Novel Floor Sensor Network Technology Based on Dielectric Electro-Active Polymers

Pintér

2015

Period. Polytech. Mech. Eng.

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“…In this work, capacitance sensing circuit shown in [21] is used for the proposed sensing node architecture in Fig. 1.…”

Section: Proposed Approachmentioning

confidence: 99%

Capacitance sensing and energy harvesting for wireless health monitoring system

Mustapha

Alam

Khan

et al. 2016

2016 International Conference on Intelligent Systems Engineering (ICISE)

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In this work, a self-generated power capacitance measurement circuit for wireless health monitoring system is proposed. Hybrid energy from thermal and solar energy is expected to be used to supply the energy harvester. The present results has shown using low cost, off-the-shelf components, the capacitance measurement circuit is able to sense a linear capacitance range of 9.8 -10.35 pF over 1.478 -1.57 V output voltage range. This circuit also has low power consumption of 3.1 mW at frequency 40 kHz. This circuit is suitable for wireless health monitoring system.

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A low-power capacitance measurement circuit with high resolution and high degree of linearity

Cited by 30 publications

References 6 publications

Weakly-Coupled Resonators in Capacitive Readout Circuits

Weakly-Coupled Resonators in Capacitive Readout Circuits

A Novel Floor Sensor Network Technology Based on Dielectric Electro-Active Polymers

Capacitance sensing and energy harvesting for wireless health monitoring system

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