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Active notch filter
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Old 8th October 2003, 06:39 PM   #1
5th element is offline 5th element  United Kingdom
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Default Active notch filter

http://www.linkwitzlab.com/filters.htm#7

This shows a notch filter.

Does anyone know the design formula for design B?

Am I being an idiot and not recognising that its actually there?

Cheers for any help Matt
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Old 8th October 2003, 07:56 PM   #2
moamps is offline moamps  Croatia
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Hi,

http://www.linkwitzlab.com/images/graphics/inductr2.gif

Regards
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Old 8th October 2003, 08:56 PM   #3
5th element is offline 5th element  United Kingdom
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Yes that tells you how to calculate the value of the inductor.
But what about the frequency it all works at?
The Q of the notch? and
The size of the notch (db)?

I knew about that bit but not the rest.
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Old 8th October 2003, 09:53 PM   #4
jackinnj is offline jackinnj  United States
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Active notch filter
Quote:
Originally posted by 5th element
Yes that tells you how to calculate the value of the inductor.
But what about the frequency it all works at?
The Q of the notch? and
The size of the notch (db)?

I knew about that bit but not the rest.
You should probably step back for a minute and take a look at some of the tutorials on filter design.

TI has a good tutorial on their website.
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Old 9th October 2003, 10:05 AM   #5
5th element is offline 5th element  United Kingdom
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Look I have used active filters in the past to great effect and am in the process of building another. I know how to use them. This project tho calls for a notch filter which I have never had to use before. So hence I dont know how to calculate one. All I need to know is the formulas. If TI has this which I will look into then great. I was just wondering wheather anyone knew the formula LW has used in that notch.
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Old 9th October 2003, 12:20 PM   #6
jackinnj is offline jackinnj  United States
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I don't think that Linkwitz changed any of the principles of electrical engineering.

Q = w0 RC
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Old 9th October 2003, 12:26 PM   #7
moamps is offline moamps  Croatia
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Gyrator (simulate inductor)

http://www.national.com/an/AN/AN-435.pdf
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File Type: jpg gyrator.jpg (30.1 KB, 221 views)
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Old 6th February 2004, 10:06 PM   #8
JensRasmussen is offline JensRasmussen  Denmark
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Default I think there is an error here ?

Hi,

The drawing has an error I think.

The parallel resistor across the inductor needs to be R2-R1.

Quote:
Originally posted by moamps

http://www.linkwitzlab.com/images/graphics/inductr2.gif
\Jens
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