Convert Digital Filter to Analog Filter?

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digi001

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If i have a digital filter running in code with B0,B1,B2 and A0,A1 @ 20khz and I need to build an equivalent analog filter with the same response. How would I do this?
 

templemark said:
If i have a digital filter running in code with B0,B1,B2 and A0,A1 @ 20khz and I need to build an equivalent analog filter with the same response. How would I do this?
Click to expand...

It's not possible. Digital filters - like all time-discrete systems - have a periodic frequency response (period determined by the clock rate).
This cannot be established in the analog domain. You only can approximate the transfer function within the first period.
 

Yes. I mean choosing a 20kHz set period for the digital filter loop, cant a transformation then be made to approximate this in continuous?
 

templemark said:
cant a transformation then be made to approximate this in continuous?
Click to expand...
one simple way you may try is a bilinear transformation to map your filter to the s plane...
 

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