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Seminars and Articles

THAT Corporation seminars and articles are provided in Adobe' s PDF format. You need to have Adobe's free Acrobat Reader installed on your computer to view these files.

Seminars:

Interfacing Digitally-Controlled Microphone Preamplifiers to A/D Converters (1,281k)
by Gary Hebert, CTO, and Joe Lemanski, Applications Enginering Manager, THAT Corporation
Presented at the 133rd AES Convention

This seminar examines practical designs for a digitally controlled microphone preamplifier driving typical modern audio A/D converters. Topics covered include maximizing the available A/D converter dynamic range, achieving the desired preamp gain range, and implementing digitally controlled switching of pads and phantom power.

De-Integrating Integrated Circuit Preamps (1,422k)
by Les Tyler, President, THAT Corporation
Presented at the 131st AES Convention

For many years, IC suppliers -- including THAT -- have offered several highly integrated analog microphone preamplifiers. These ICs are convenient and easy to use, and generally include the input-stage feedback resistors plus an output differential amplifier. While convenient, these included elements reduce the preamps' flexibility and restrict performance in some areas compared with that obtainable from discrete designs. In this seminar, we present a new-generation of analog IC microphone preamplifiers that offer more flexibility and higher performance through selective omission of internal items. We will review the benefits and detriments of this approach, and offer many practical tips on how to get the most out of these new ICs.

Designing Microphone Preamplifiers (344k)
by Gary Hebert, Chief Technology Officer, THAT Corporation
Presented at the 129th AES Convention

The tutorial stresses microphone preamplifiers as a fundamental building block in professional audio systems, with a legacy reaching back to the beginning of recording and provides a primer on microphone preamplifier design requirements, potential fault conditions and solutions. A sampling of amplifier circuits and topologies is presented, with a discussion on the compromises between cost, size, power consumption, noise, THD, CMR and other factors.

THAT New Digitally Controlled Mic Preamplifier (1,014k)
After years of not-so-clandestine R&D, THAT Corporation is finally ready to unveil its high performance digitally controlled microphone preamp. This seminar offers a comprehensive look at the design and offers many tips on how to apply it. The seminar will include a live demonstration. Originally presented at the 127th AES Convention.

More Analog Secrets Your Mother Never Told You (951k)
At the 127th AES Convention attendees were invited to attend a new THAT exhibitor seminar — "More Analog Secrets Your Mother Never Told You". A sequel to our popular first "Analog Secrets" seminar, the new presentation provides tips and techniques to achieve optimal performance from microphone preamps like the THAT1580. The seminar includes sections covering phantom power switching, phantom power protection, RFI power protection, input pads and line inputs and output stages for mic preamps.

Analog Secrets Your Mother Never Told You (1528k)
At the 123rd AES Convention attendees were invited to attend THAT's exhibitor seminar "Analog Secrets Your Mother Never Told You". The seminar provided tips and techniques to achieve optimal performance in the analog signal path with topics ranging from inputs to outputs to analog signal processing. The presenters were analog IC design experts from THAT Corporation, the world’s only semiconductor foundry specializing exclusively in pro audio ICs.

Articles:

THAT's Balanced Line Drivers and Receivers (993k)
AudioXpress, June 2010 -- By Gary Galo, Regular Contributor
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.....After surveying the field, it became clear that the products from THAT Corporation offer superior performance to any of their competitors' chips.....
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Reprinted, with permission by Audio Amateur Press, from audioXpress, Volume 41, Issue 6, 2010, by Gary Galo © Copyright 2010, Audio Amateur Corporation, P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.

AES 2009 Convention Report (2,045k)
AudioXpress, June 2010 -- By Gary Galo, Regular Contributor
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...THAT Corporation presented another excellent manufacturer's seminar, a sequel to their "Analog Secrets Your Mother Never Told You". At this year's presentation, they discussed their new 1570 high-performance microphone preamplifier. The 1570 employs a current feedback amplifier and has a slew rate of 53V/µs....
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Reprinted, with permission by Audio Amateur Press, from audioXpress, Volume 41, Issue 6, 2010, by Gary Galo, © Copyright 2010, Audio Amateur Corporation, P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.

Cross-coupled Output Stages for Balanced Audio Interfaces
EE Times, August, 2008 -- By Leslie Tyler, THAT Corporation
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Designers might think that balanced audio line drivers are easy, but while today's active stages can improve on traditional transformer designs, attention to detail is important in order to optimize common-mode rejection and preserve performance when driving single-ended loads.

Optimizing Dynamic Range of Balanced Audio Inputs
EE Times, September 22, 2008 -- By Bob Moses, THAT Corporation
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Balanced interfaces are ubiquitous in professional audio systems due to their ability to reject common-mode hum and noise. They are especially important in long-distance connections where each end has a different ground reference. Maximizing common-mode rejection (CMR) is often a primary concern of designers. This article explores another important consideration--maximizing dynamic range.

AES 2007 Convention Report (1,444k)
AudioXpress, June 2008 -- By Gary Galo, Regular Contributor
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Page 27 .....THAT Corporation gave an excellent seminar titled “Analog Secrets Your Mother Never Told You,” a presentation by four representatives of the company, each focusing on a specific product line and application. All of the presentations were excellent, but I was particularly interested in the one given by Gary Hebert, Chief Technology Officer, titled “Balanced Outputs.” ....
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Reprinted, with permission by Audio Amateur Press, from audioXpress, Volume 39, Issue 6, 2008, by Gary Galo, p. 24. © Copyright 2008, Audio Amateur Corporation, P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.

A Matter of Balance: line-receiver CMR in real-world environments (2,813k)
EDN, November 21, 2005 -- By Joshua Israelsohn, Contributing Technical Editor
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Few applications allow you to control the source impedance of your incoming signals, yet your line receiver's CMR can hang in the balance.

More of This, Les of THAT (62k)
Pro Sound News, March 2005 -- By Fred Goodman, Managing Editor
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PSN profile of THAT Corporation President, Les Tyler.

Subtleties count in wide-dynamic-range analog interfaces
EDN, June 4, 1998 -- By Bill Whitlock, Jensen Transformers
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Transporting high-dynamic-range analog signals from one piece of equipment to another is not a trivial task. Even subtle design variations can make huge differences in the equipment's ability to reject interference from the ac power line and other sources when the equipment connects to a real-world system.

Borrowing Pro Audio Technology to Optimize ADCs ( 1,187k)
Electronic Design - Application Issue, June 24, 1996; By Leslie Tyler, THAT Corporation
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Methods developed for pro audio applications can be applied to many other industries, such as data-acquisition, instrumentation, and industrial control - wherever a wide dynamic range signal must be accepted by electronics with limited dynamic range....
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