Text and/or other creative content from Biquad filter was copied or moved into Electronic filter topology with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
Text and/or other creative content from Multiple feedback topology (electronics) was copied or moved into Electronic filter topology with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
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I think the separate articles should be kept separate. They are not in danger of deletion, and they will only grow larger, not smaller. Rather than combine now and then separate out again later when they grow large, lets leave them as separate article with this page as a convenient jumping off point. No need to wonder whether this page has the article, or whether its been separated out. PAR ( talk) 05:10, 29 November 2007 (UTC)
Maitchy ( talk) 23:37, 18 January 2009 (UTC)
I'm against this. I am planning on writing a lengthy article on Zobel networks. It would not be sensible to merge this article with the proposed merge, but a filter topology article is a good jumping off point for it. I may well follow this with an article on constant k and m-derived filters. These are variations of the Cauer topology and may result in some expansion of that article as well. However, the three "op-amp" topologies, Sallen-Key, Multiple Feedback and State Variable I agree could be merged, at least as they stand now. The Cauer topology is a different animal, I feel, and should be left separate, as should the topologies page. SpinningSpark 16:37, 2 March 2008 (UTC)
The reason I think your natural frequency equation is wrong is because R3 control the Q of the second order system so for all R's and C's equal (except for R3 which should be sized as Q*R), your natural frequency should be 1/RC not 1/(sqrt(Q)*RC). http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00491051 and http://cng.ateneo.edu/cng/wyu/works/papers/tow-thomas.pdf should confirm the changes I made.
The article claims that "Ladder topology, often called Cauer topology after Wilhelm Cauer (inventor of the elliptic filter), was in fact first used by George Campbell (inventor of the constant k filter). Campbell published in 1922 but had clearly been using the topology for some time before this."
If that is the case and Campbell used the ladder topology before 1922, why is the topology called Cauer and not Campbell?
ICE77 ( talk) 16:32, 6 August 2015 (UTC)
Is the Tow-Thomas circuit an example of single-amplifier biquad or two-integrator-loop circuit?
ICE77 ( talk) 21:48, 28 October 2015 (UTC)
The bottom right op-amp of the A-M schematic (the op-amp which provides the low-pass output) should have its INVERTING input grounded --- the opposite of most common uses. On the Web, pretty much only the University of Oregon duplicates this error. Note how the op-amp above inverts the signal, providing the necessary negative feedback. 73.207.126.214 ( talk) 20:23, 27 March 2023 (UTC)
Text and/or other creative content from Biquad filter was copied or moved into Electronic filter topology with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
Text and/or other creative content from Multiple feedback topology (electronics) was copied or moved into Electronic filter topology with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||||||
|
I think the separate articles should be kept separate. They are not in danger of deletion, and they will only grow larger, not smaller. Rather than combine now and then separate out again later when they grow large, lets leave them as separate article with this page as a convenient jumping off point. No need to wonder whether this page has the article, or whether its been separated out. PAR ( talk) 05:10, 29 November 2007 (UTC)
Maitchy ( talk) 23:37, 18 January 2009 (UTC)
I'm against this. I am planning on writing a lengthy article on Zobel networks. It would not be sensible to merge this article with the proposed merge, but a filter topology article is a good jumping off point for it. I may well follow this with an article on constant k and m-derived filters. These are variations of the Cauer topology and may result in some expansion of that article as well. However, the three "op-amp" topologies, Sallen-Key, Multiple Feedback and State Variable I agree could be merged, at least as they stand now. The Cauer topology is a different animal, I feel, and should be left separate, as should the topologies page. SpinningSpark 16:37, 2 March 2008 (UTC)
The reason I think your natural frequency equation is wrong is because R3 control the Q of the second order system so for all R's and C's equal (except for R3 which should be sized as Q*R), your natural frequency should be 1/RC not 1/(sqrt(Q)*RC). http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00491051 and http://cng.ateneo.edu/cng/wyu/works/papers/tow-thomas.pdf should confirm the changes I made.
The article claims that "Ladder topology, often called Cauer topology after Wilhelm Cauer (inventor of the elliptic filter), was in fact first used by George Campbell (inventor of the constant k filter). Campbell published in 1922 but had clearly been using the topology for some time before this."
If that is the case and Campbell used the ladder topology before 1922, why is the topology called Cauer and not Campbell?
ICE77 ( talk) 16:32, 6 August 2015 (UTC)
Is the Tow-Thomas circuit an example of single-amplifier biquad or two-integrator-loop circuit?
ICE77 ( talk) 21:48, 28 October 2015 (UTC)
The bottom right op-amp of the A-M schematic (the op-amp which provides the low-pass output) should have its INVERTING input grounded --- the opposite of most common uses. On the Web, pretty much only the University of Oregon duplicates this error. Note how the op-amp above inverts the signal, providing the necessary negative feedback. 73.207.126.214 ( talk) 20:23, 27 March 2023 (UTC)