Regarding Low Pass Butterworth Filters

[Anantha Krishna]

Hi All,

I have two types of Butterworth Filters. Both are designed for 1kHz. I have attached the images of the both.

I am little new this Active Filters.

Please let me understand more by your valuable inputs for the following doubts:

1. What is the difference between these filters w.r.t frequency response, Stop band and Pass band attenuation?

2. How can I vary the Stop band and Pass band attenuation of the same?

3. What are the advantages and disadvantages with one another? Which one is better and easier[Easy to design] to use?

 

[klystron]

Get a copy of Sapwin (**broken link removed**), enter your filter circuits and "play" with the program

 

[LvW]

Hi Anantha,

please check your design again:

* The filter with unity gain has a Butterworth response with a cut-off frequency of approx. 700 Hz (not 1k)
* The filter with gain=2 has no Butterworth response but rather a Chebyshev response (cut-off at 1 kHz).