Abstract
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 \(\upmu \)W.
INSPIRE faculty fellowship (DST/INSPIRE/04/2016/000216) from the Department of Science Technology.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Ford, R.M., Weissbach, R.S., Loker, D.R.: A novel DSP-based LVDT signal conditioner. IEEE Trans. Instrum. Meas. 50(3), 768–773 (2001)
Masi, A., Danzeca, S., Losito, R., Peronnard, P., Secondo, R., Spiezia, G.: A high precision radiation-tolerant LVDT conditioning module. Nucl. Instrum. Methods Phys. Res. A
Banerjee, K., Dam, B., Majumdar, K.: A novel FPGA-based LVDT signal conditioner
Analog Devices: LVDT Signal Conditioner. AD598 Application Note (1989)
Analog Devices: Universal LVDT Signal Conditioner. AD698 Application Note (1995)
Murphy, E., Slattery, C.: Direct digital synthesis (DDS) controls waveforms in test, measurement and communications. Analog Dialogue 39, 12–15 (2005)
Dam, B., Banerjee, K., Majumdar, K., Banerjee, R., Patranabis, D.: A zero phase-lag homodyne demodulation technique for synchronous measurement applications and its FPGA implementation. J. Circuits Syst. Comput. 14(4), 771–791 (2005)
Novacek, G.: Accurate linear measurement using LVDTs. Circuit Cellar Ink 106, 20–27 (1999)
Flammini, A., Marioli, D., Sisinni, E., Taroni, A.: A multichannel DSP-based instrument for displacement measurement using differential variable reluctance transducer. IEEE Trans. Instrum. Meas. 54(1), 178–183 (2005)
Masi, A., Danzeca, S., Losito, R., Peronnard, P., Secondo, R., Spiezia, G.: A high precision radiation-tolerant LVDT conditioning module. Nucl. Instrum. Methods Phys. Res. Sect. A: Accel. Spectrom. Detect. Assoc. Equip. 745, 73–81 (2014). https://doi.org/10.1016/j.nima.2014.01.054. ISSN 0168–9002
Misra, P., Mohini, S.K., Mishra, S.K.: ANN-based non-linearity compensator of LVDT sensor for structural health monitoring. In: Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems - SenSys 2009 (2009)
Petchmaneelumka, W., Songsuwankit, K., Rerkratn, A., Riewruja, V.: Simple LVDT signal conditioner. In: 2017 3rd International Conference on Control, Automation and Robotics (ICCAR), Nagoya, pp. 758–761 (2017). https://doi.org/10.1109/ICCAR.2017.7942799
Banerjee, K., Dam, B., Majumdar, K.: An FPGA-based integrated signal conditioner for measurement of position, velocity and acceleration of a rotating shaft using an incremental encoder. In: 2016 IEEE First International Conference on Control, Measurement and Instrumentation (CMI), Kolkata, pp. 440–444 (2016). https://doi.org/10.1109/CMI.2016.7413786
Debnath, D.S., Pal, M., Banerjee, K., Dam, B., Majumdar, K.: An FPGA-based incremental encoder signal conditioner with reduced error in rotational rate estimation over a wide range of rotational speeds. In: 2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC), Kolkata, pp. 120–124 (2016). https://doi.org/10.1109/CIEC.2016.7513785
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Raghunath, K.P., Manu Sagar, K.V., Gokulan, T., Kumar, K., Thakur, C.S. (2019). ASIC Based LVDT Signal Conditioner for High-Accuracy Measurements. In: Sengupta, A., Dasgupta, S., Singh, V., Sharma, R., Kumar Vishvakarma, S. (eds) VLSI Design and Test. VDAT 2019. Communications in Computer and Information Science, vol 1066. Springer, Singapore. https://doi.org/10.1007/978-981-32-9767-8_33
Download citation
DOI: https://doi.org/10.1007/978-981-32-9767-8_33
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-32-9766-1
Online ISBN: 978-981-32-9767-8
eBook Packages: Computer ScienceComputer Science (R0)