Simplified digital lock-in amplifier algorithm
Article
Article Title | Simplified digital lock-in amplifier algorithm |
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ERA Journal ID | 4411 |
Article Category | Article |
Authors | Leis, J. (Author), Martin, P. (Author) and Buttsworth, D. (Author) |
Journal Title | Electronics Letters |
Journal Citation | 48 (5), pp. 259-261 |
Number of Pages | 3 |
Year | 2012 |
Place of Publication | United Kingdom |
ISSN | 0013-5194 |
1350-911X | |
Digital Object Identifier (DOI) | https://doi.org/10.1049/el.2012.0193 |
Web Address (URL) | https://digital-library.theiet.org/content/journals/10.1049/el.2012.0193 |
Abstract | The phase-sensitive or 'lock-in' amplifier is a fundamental tool in experimental physics, and is able to extract exceedingly small signals in the presence of noise. Recently, there has been some interest in portable or embedded lock-in amplifiers for instrumentation and sensing. One difficulty with digital lock-ins is the required degree of numerical precision. This letter presents a fast algorithm for combined phase-sensitive multiplication and filtering. It exploits symmetry to reduce the number of arithmetic operations, and is suitable for low-power embedded devices. As well as being computationally much simpler than a direct digital implementation, the results presented show that it yields a lower error in the estimation of the underlying signal amplitude. |
Keywords | digital instrumentation; measurement; digital filters; amplifiers; low-power electronics |
ANZSRC Field of Research 2020 | 400907. Industrial electronics |
400607. Signal processing | |
400801. Circuits and systems | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Department of Electrical, Electronic and Computer Engineering |
University of Manchester, United Kingdom | |
Computational Engineering and Science Research Centre | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q12vw/simplified-digital-lock-in-amplifier-algorithm
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