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Old 05-01-2006, 04:50 PM
Roger Bourne
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Default Output bus bit resolution of a digital filter

Hello all,

Does anyone know of a link/web page/article/ that gives the equations
to calculating the output databus bit resolution of a digital filter.

I imagine the following factors should be somewhere in the equations:
1. input databus resolution of the digital filter
2. scaling factor of the coeffciients to their binary equivalents
3. DCgain of the FF coeffcicients (if it is an IIR)
4. order of filter, type of filter, number of taps/coeffcients ....
5. Maximum amplification that the filter will allow, for any given
frequency

Please advise
-Roger

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Old 05-02-2006, 01:00 PM
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Default Re: Output bus bit resolution of a digital filter

Hi Roger,

I think output databus resolution is dependent mainly on the other
components you have on the board...eg it may be a serial ADC or 12 bit
wide.


Roger Bourne wrote:
> Hello all,
>
> Does anyone know of a link/web page/article/ that gives the equations
> to calculating the output databus bit resolution of a digital filter.
>
> I imagine the following factors should be somewhere in the equations:
> 1. input databus resolution of the digital filter
> 2. scaling factor of the coeffciients to their binary equivalents
> 3. DCgain of the FF coeffcicients (if it is an IIR)
> 4. order of filter, type of filter, number of taps/coeffcients ....
> 5. Maximum amplification that the filter will allow, for any given
> frequency
>
> Please advise
> -Roger


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