help me to diffential those filters....

can someone tell me wat is the different between those filters i named below :

- normal filter
- butterworth filter
- bessel filter
- sallen-key architeture filter
- multi-feedback architeture filter

thx lots...

Hello,

Filters are basically of two types passive and active. Passive filters use RLC components for selecting the cut off frequencies. Active filters have passive components as well as active components like operational amplifiers. Passive filter topologies are basically T network, Pi networks.

Active filter topologies are

Butterworth
Chebychev
Bessel


Butterworth filter gives maximum passband flatness whereas the rolloff is a concern

Chebychev provides good rolloff but it may oscilate in passband.

Bessel filter have a linear phase response over a wide rande of frequencies. but pass band ripples are of concern.


Sallen-key and multiple feedback are second order architectures

Hope this helps. Have a look at the document

Thanks
Kasi

to chviswanadh

very very thx for information. is very usefull for me...thx lots



so means sallen key/multi feedback is different with 2nd order of butterworth filter izt?

Hello,

Sallen key and multiple feedback are the topolagies that u can use for the type of filter. These can be used for implementing butterworth filter as well. These are not only second order but can be implemented for higher orders as well.

Go through texas instruments site. U can get material

Thanks
Kasi