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Micro-Electro-Mechanical System (MEMS) sensors are integrated with suitable signal conditioning unit (SCU) to provide usable output. Though the output of the SCU can be either analog or digital, digital output is often required in many system applications where other components are mostly digital. This work integrates a sigma-delta (ΣΔ) Analog to Digital Converter (ADC) with an analog front-end for...
In a previous work [1], a phase angle based conductivity sensing is reported, using a polymer (DQN-70) coated epoxy probe. That reported sensor is robust, light weight and low cost and its sensing technology is a simple and novel one. But, the sensing range is limited to low value (10 μS/cm to 1 mS/cm) and it needs high frequency excitation (200 kHz, 2 MHz and more). This paper aims to overcome those...
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