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ASIC Based LVDT Signal Conditioner for High-Accuracy Measurements

Raghunath, KP and Manu Sagar, KV and Gokulan, T and Kumar, K and Thakur, CS (2019) ASIC Based LVDT Signal Conditioner for High-Accuracy Measurements. In: 23rd International Symposium on VLSI Design and Test, VDAT 2019, 4 - 6 July 2019, Indore, pp. 385-397.

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Official URL: https://doi.org/10.1007/978-981-32-9767-8_33


A novel Application-Specific Integrated Circuit (ASIC) based signal conditioning system for closed loop control of Linear Variable Differential Transformer (LVDT) for sensor interface application is presented in this paper. The LVDTs are used for measuring linear displacement in industrial, military, aerospace, sub-sea, downhole drilling, nuclear power and process control applications. The signal conditioning is achieved through an ASIC-based digital signal processing unit. The existing commercially available Integrated Circuits (ICs) for LVDT signal conditioning are mostly analog and additional external circuitry is required for processing. The proposed system is a digital implementation of the LVDT signal conditioner with a better dynamic response and linearity through closed loop control. A unique feature of this ASIC is the use of synchronous demodulation technique using ADC sampling, reducing the complexity involved in conventional AM demodulation circuits. One of the major advantages of digital implementation is that the system can be reconfigured through external supervisory control. In this implementation, this is enabled by a universal asynchronous receiver-transmitter (UART) interface. This makes the system suitable for a wide range of applications. The functionality of the system was verified through a Verilog implementation on ARTIX-7 Field Programmable Gate Array (FPGA). The ASIC design is implemented in SCL-180 nm technology with an area 1 mm X 1 mm and the power utilization is 285 µW.

Item Type: Conference Paper
Publication: Communications in Computer and Information Science
Publisher: Springer
Additional Information: The copyright for this article belongs to Springer.
Keywords: Application specific integrated circuits; Closed loop control systems; Demodulation; Digital signal processing; Field programmable gate arrays (FPGA); Military applications; Nuclear fuels; Optical variables measurement; Strain measurement; VLSI circuits, High-accuracy measurements; Integrated circuits (ICs); Linear variable differential transformer; LVDT; Process-control applications; Signal conditioners; Signal conditioning systems; Universal asynchronous receiver transmitters, Signal conditioning circuits
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 05 Dec 2022 05:49
Last Modified: 05 Dec 2022 05:49
URI: https://eprints.iisc.ac.in/id/eprint/78207

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