filter design questions

[allennlowaton]

Hello EDA fellows,

I have some questions regarding filter design.
Hope you can have a look at this one.



Concern #1. From the diagram at the left, I have read some papers having a 0dB and -3dB passband gain. I want to ask what's the typical value for that? What could be the possible reasons for using such values?

Concern #2. Shown on the right side are the corner variations (FF,TT and SS). I also read some papers which has 5% to 10% variations on the passband amplitude/gain. What are the typical values in a general applications for that one?

Thank you.

 

[milind.a.kulkarni]

I have a question here is it a band pass filter ? .....

If yes... refer following links-

Band-pass filter - Wikipedia, the free encyclopedia
http://www.iaeng.org/publication/IMECS2009/IMECS2009_pp364-367.pdf
**broken link removed**

You will get the values of the components from link no -3

Now to answer your first question - 3db is filtering attenuation you will get it bcz of transfer function frequecy charactersitics as....gain will be maximized for the frequecnies that you want to allow and will be decresed for the other frequecnies....
Good Luck