This paper presents the design and experimental characterization of a portable highprecision\nsingle-phase lock-in instrument with phase adjustment. The core consists of an analog\nlock-in amplifier IC prototype, integrated in 0.18 microm CMOS technology with 1.8 V supply, which\nfeatures programmable gain and operating frequency, resulting in a versatile on-chip solution with\npower consumption below 834 microW. It incorporates automatic phase alignment of the input and\nreference signals, performed through both a fixed -90Degreeand a 4-bit digitally programmable phase\nshifter, specifically designed using commercially available components to operate at 1 kHz\nfrequency. The system is driven by an Arduino YUN board, thus overall conforming a low-cost\nautonomous signal recovery instrument to determine, in real time, the electrical equivalent of\nresistive and capacitive sensors with a sensitivity.............................
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