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IC Products > About THAT > PR and News > News 1410  
  October 2014  
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THAT CTO Presents Paper at AES Convention
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  Gary Hebert
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Gary Hebert
CTO, THAT Corporation

DC Servos and Digitally-Controlled Microphone Preamplifiers
by Gary Hebert, CTO That Corporation
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Microphone preamplifiers for professional audio applications require a very wide range of gain and low noise in order to provide a high-quality interface with the vast number of available microphones. In many modern systems the preamplifier gain is controlled indirectly via a digital interface in discrete steps. Often dc servo amplifiers are employed as a means of keeping the dc gain fixed to avoid large changes in output offset voltage while the audio band gain is varied. The resulting highpass filter response varies substantially as a function of the preamplifier gain. We investigate the frequency and time-domain effects of this. We also investigate several approaches to minimize these effects. Convention Paper 9198.

Download the paper: DC Servos and Digitally-Controlled Microphone Preamplifiers

Gary's Convention Paper (#9198) and many other technical papers of note are
available from the AES E-Library.

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About THAT Corporation
THAT Corporation, founded in 1989, designs, manufactures, and sells high-performance analog integrated circuits for professional audio manufacturers. THAT’s ICs include InGenius® input and OutSmarts® output stages, low-noise preamplifiers, Analog Engine® processors, and its original line of Blackmer® voltage-controlled amplifiers (VCAs) – all used throughout the pro audio industry. Under the dbx-tv® brand name, THAT also licenses patents, trademarks, and other intellectual property to the TV broadcast and reception industries. These include Total Sonics™, Total Surround™, and Total Volume™, audio enhancement technology and digital implementations of worldwide legacy TV audio receiver standards. The company is headquartered in Milford, Massachusetts, with offices in Milpitas, California.

For more information, contact:
  THAT Corporation, 45 Sumner Street, Milford, MA 01757-1656 , USA
  Telephone: +1 (508) 478-9200; Fax +1 (508) 478-0990
  Email:

Editorial Contact:
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  Tel: +1 (508) 478-9200 x108
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