| Ultra-low-noise preamplifier for condenser microphones. | |
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MedLine Citation:
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PMID: 21198039 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The paper presents the design of a low-noise preamplifier dedicated for condenser measurement microphones used in high sensitivity applications, in which amplifier noise is the main factor limiting sensitivity of the measurements. In measurement microphone preamplifiers, the dominant source of noise at lower frequencies is the bias resistance of the input stage. In the presented solution, resistors were connected to the input stage by means of switches. The switches are opened during measurements, which disconnects the resistors from the input stage and results in noise reduction. Closing the switches allows for fast charging of the microphone capacitance. At low frequencies the noise of the designed preamplifier is a few times lower in comparison to similar, commercially available instruments. |
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Authors:
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Tomasz Starecki |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Review of scientific instruments Volume: 81 ISSN: 1089-7623 ISO Abbreviation: Rev Sci Instrum Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2011-01-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: United States |
Other Details:
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Languages: eng Pagination: 124702 Citation Subset: IM |
Affiliation:
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Institute of Electronic Systems, Warsaw University of Technology, 00-665 Warsaw, Nowowiejska 15∕19, Poland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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