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Old 15th February 2004, 02:38 AM   #1
andy_c is offline andy_c  United States
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Default New web page for active RIAA EQ design

Hi all,

I realize that this topic has been beaten to death over the years, especially in the Lipshitz paper, but I've created a web page dedicated to the design of active RIAA equalization circuitry. It's not an "advocacy" site per se, but rather attempts to provide factual information. The question of "why yet another treatment of this subject?" is addressed there

There's info on how to match the Neumann time constant, which the Lipshitz paper doesn't deal with directly. You can probably obtain this info by doing more algebra on Lipshitz' results, but to do so would be, as Donald Rumsfeld might say, "a hard slog".

Most of the info is stuff from a paper I wrote when I was in college 23 years ago. I thought I'd just quickly write it up and put it on the web. It ended up taking a lot more time than I thought it would. One feature which I believe to be unique is the use of passive network synthesis techniques to get the component values. Specifically, a Foster expansion of the z11 of the feedback network is used. This is described in an appendix. This is different from what Lipshitz does. He derives the transfer function from the component values, then uses simultaneous equations to get the design equations from the analysis. In contrast, with the synthesis approach, the values just "pop out".

If you spot any errors, please let me know. Constructive criticism is most welcome. It's not likely that I'll do any other topologies, since my time is quite limited due to job and commute issues. However I'll surely correct any errors found.

The page is at http://home.mindspring.com/~andy_c/P...eampDesign.htm

I hope this will be useful to someone.
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Old 15th February 2004, 03:01 AM   #2
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