No phase shift filter

Henry Winkler · 2006-12-09T22:45:38+00:00

Can anyone provide information on active filter designs thatincorporate, or eliminate the need for, phase shift compensation?I am looking for either a circuit diagram or supplier of a specializedIC for notch and low pass in the audio range.Or, are there any general design rules that help minimize phase shiftin Sallen-Key, or other standard, active filters?Thanks for any suggestions.Henry Winkler

Dec 09, 2006 22 Replies

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Don Lancaster 19 years ago

Digital filters can easily give you zero phase shift. Because they are trivial to implement negative time.

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Ken Smith 19 years ago

In article , Don Lancaster wrote: [....]

This is only true if you ignore the fact that they must be applied to the data after it is gathered. You can't do it in real time.

-- kensmith@rahul.net forging knowledge

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Phil Hobbs 19 years ago

If you're willing to move the time origin, you can add as much linear phase shift of either sign as you like. The reason for sticking with normal time is that all the useful causality conditions depend on that definition. I invite you to use your 'negative time' to stabilize a feedback loop.

Cheers,

Phil Hobbs

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