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- W2073866636 abstract "In this paper, a monolithic integrated piezoresistive flow sensor is presented, which was fabricated with an intermediate CMOS (complementary metal-oxide semiconductor) MEMS (micro electro mechanical system) process compatible with integrated pressure sensors. Four symmetrically arranged silicon diaphragms with piezoresistors on them were used to sense the drag force induced by the input gas flow. A signal conditioning CMOS circuit with a temperature compensation module was designed and fabricated simultaneously on the same chip with an increase of the total chip area by only 35%. An extra step of boron implantation and annealing was inserted into the standard CMOS process to form the piezoresistors. KOH anisotropic etching from the backside and deep reactive ion etching (DRIE) from the front side were combined to realize the silicon diaphragms. The integrated flow sensor was packaged and tested. The testing results indicated that the addition of piezoresistor formation and structure releasing did not significantly change any of the circuitry characteristics. The measured sensor output has a quadratic relation with the input flow rate of the fluid as predicted. The tested resolution of the sensor is less than 0.1 L min−1 with a measurement range of 0.1–5 L min−1 and the sensitivity is better than 40 mV per (L min−1) with a measurement range of 4–5 L min−1. The measured noise floor of the sensor is 21.7 µV rtHz−1." @default.
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- W2073866636 date "2010-02-18" @default.
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- W2073866636 title "Monolithic integration of a micromachined piezoresistive flow sensor" @default.
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- W2073866636 doi "https://doi.org/10.1088/0960-1317/20/3/035024" @default.
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