A low power CMOS integrated circuit for implantable sensor

Zhang, M.; Islam, Syed K.; Adeeb, M.A.; Vijayaraghavan, R.

doi:10.1109/mwscas.2005.1594278

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2013

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“…Power consumption is in particular a major challenge of designing these sensing systems as they should reliably function within a small portable low-power device for a long period of time [1], [2]. Capacitive sensing is a desirable transduction mechanism for low-power sensor design as the sensing element consumes no energy and main focus can be concentrated on designing the interface circuitry [3].…”

Section: Introductionmentioning

confidence: 99%

A readout circuit with wide dynamic range for differential capacitive sensing applications

Aezinia

Bahreyni

2013

2013 26th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)

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This paper presents a compact, low power, digitally assisted differential capacitive-sensing readout circuit. It utilizes digital design and switch-based synchronous demodulator to reduce area and power consumption while improving the robustness of the system by diminishing the effects of interfering signals. To broaden the sensing range of the system, the simple implementation of a closed-loop configuration is employed to dynamically adjust the gain. This circuit is designed, analyzed, and laid out in a standard CMOS technology from Austria Microsystems. Post-layout simulation results reveal that the proposed circuit is capable of resolving a minimum of changes in input capacitance under test.Index Terms-Capacitive sensing, feedback loop, interface circuit.

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Section: Introductionmentioning

confidence: 99%