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- W4286572033 abstract "There is a growing interest in developing impedance sensors for a wide variety of industrial applications. For impedance magnitudes that change slowly over time or that are static a lock-in amplifier (an AM demodulator) is a common solution. On the other hand, there are situations where low-power consumption and low-voltage operation is mandatory as in the internet-of-things scenario. In this work, we propose a simple lock-in amplifier that relies on a fully-differential amplifier that is enabled/disabled with a power-down signal synchronized to the carrier, effectively acting as a mixer. A further passive low-pass filter recovers the information of the unknown impedance. The proposed system is able to measure resistive and reactive impedances by using a power-down signal in phase or in quadrature to the carrier. We show experimental results for a set of resistors and capacitors that, once properly calibrated, yield errors below 0.5 % for resistors and below 1.7 % for capacitors." @default.
- W4286572033 created "2022-07-22" @default.
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- W4286572033 date "2022-06-07" @default.
- W4286572033 modified "2023-10-17" @default.
- W4286572033 title "Complex impedance measurement front-end based on an on/off lock-in amplifier" @default.
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- W4286572033 doi "https://doi.org/10.1109/metroind4.0iot54413.2022.9831457" @default.
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