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[Discussion] Analog Sinc Filter?

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TuAtAu

TuAtAu

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Hi everyone,

I was looking at sinc filter and attracted by its characteristic (linear phase/constant group delay=good settling).
https://en.wikipedia.org/wiki/Sinc_filter

I know that sinc filter can be easily designed with DSP by averaging the last few samples. However, I am wondering, is any analog filter able to achieve this characteristic as well? Or is there analog sinc filter? Please share something/thoughts/knowledge with me if anyone know about this because I can't find anything useful with google.

Thank you.
 

The moment you look at the impulse response of a sinc filter, you immediately see the first problem. It is non-causal. No real life system can be non-causal.
 

I know that sinc filter can be easily designed with DSP by averaging the last few samples.
Click to expand...
The Wikipedia link discusses sinc impulse response (brick wall) and sinc frequency response (boxcar integrator respectively CIC) filters. Not clear which of both you want to implement.

The comment about non-causality only applies to the former. Causal filters with similar characteristic (approximate brick wall) are designed by applying a window to the impulse response.

One method to design arbitrary impulse responses in analog (magnitude and time continuous) circuits is to combine analog delay lines. It's e.g. achieved in SAW filters but can be done to some extent also with purely electrical elements.
 
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