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A Four-Channel Low-Noise Readout IC for Air Flow Measurement Using Hot Wire Anemometer in 0.18 μm CMOS Technology

Nam, Kyeongsik ; Kim, Hyungseup ; Kwon, Yongsu ; Choi, Gyuri ; Kim, Taeyup ; Kim, Chulhong ; Cho, Dongil ; Lee, Junghoon ; Ko, Hyoungho

Sensors (Basel, Switzerland), 2021-07, Vol.21 (14), p.4694 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
A Four-Channel Low-Noise Readout IC for Air Flow Measurement Using Hot Wire Anemometer in 0.18 μm CMOS Technology
Autor: Nam, Kyeongsik ; Kim, Hyungseup ; Kwon, Yongsu ; Choi, Gyuri ; Kim, Taeyup ; Kim, Chulhong ; Cho, Dongil ; Lee, Junghoon ; Ko, Hyoungho
Assuntos: Air flow ; air flow measurement ; Analog to digital conversion ; Analog to digital converters ; automatic offset calibration loop (AOCL) ; Biomimetics ; CMOS ; Digital electronics ; Digital to analog conversion ; Digital to analog converters ; Electric potential ; Flow measurement ; Flow velocity ; Heat ; Humidity ; Insect mimicking robots ; instrumentation amplifier (IA) ; Integrated circuits ; Light amplifiers ; Low pass filters ; Microelectromechanical systems ; readout integrated circuit ; Robots ; Sensors ; Signal processing ; Voltage
É parte de: Sensors (Basel, Switzerland), 2021-07, Vol.21 (14), p.4694
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Air flow measurements provide significant information required for understanding the characteristics of insect movement. This study proposes a four-channel low-noise readout integrated circuit (IC) in order to measure air flow (air velocity), which can be beneficial to insect biomimetic robot systems that have been studied recently. Instrumentation amplifiers (IAs) with low-noise characteristics in readout ICs are essential because the air flow of an insect’s movement, which is electrically converted using a microelectromechanical systems (MEMS) sensor, generally produces a small signal. The fundamental architecture employed in the readout IC is a three op amp IA, and it accomplishes low-noise characteristics by chopping. Moreover, the readout IC has a four-channel input structure and implements an automatic offset calibration loop (AOCL) for input offset correction. The AOCL based on the binary search logic adjusts the output offset by controlling the input voltage bias generated by the R-2R digital-to-analog converter (DAC). The electrically converted air flow signal is amplified using a three op amp IA, which is passed through a low-pass filter (LPF) for ripple rejection that is generated by chopping, and converted to a digital code by a 12-bit successive approximation register (SAR) analog-to-digital converter (ADC). Furthermore, the readout IC contains a low-dropout (LDO) regulator that enables the supply voltage to drive digital circuits, and a serial peripheral interface (SPI) for digital communication. The readout IC is designed with a 0.18 μm CMOS process and the current consumption is 1.886 mA at 3.3 V supply voltage. The IC has an active area of 6.78 mm2 and input-referred noise (IRN) characteristics of 95.4 nV/√Hz at 1 Hz.
Editor: Basel: MDPI AG
Idioma: Inglês

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A Four-Channel Low-Noise Readout IC for Air Flow Measurement Using Hot Wire Anemometer in 0.18 μm CMOS Technology

Nam, Kyeongsik ; Kim, Hyungseup ; Kwon, Yongsu ; Choi, Gyuri ; Kim, Taeyup ; Kim, Chulhong ; Cho, Dongil ; Lee, Junghoon ; Ko, Hyoungho

Basel: MDPI AG

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