If we want to design a passive lowpass filter, can we get its transfer just from the cutoff frequency and its attenuation without knowing the zeros and poles location?

 

Hello,

A lot of information on filter design can be found on the links of the EDUCYPEDIA.
RC and RL theory:
http://www.educypedia.be/electronics/analogrc.htm
Online calculators:
http://www.educypedia.be/electronics/electroniccalculatorsfilter.htm

The EDUCYPEDIA is a linksite with a lot of electronic links:
http://www.educypedia.be/electronics/electronicaopening.htm

Greetings,
Bertus

 

If we want to design a passive lowpass filter, can we get its transfer just from the cutoff frequency and its attenuation without knowing the zeros and poles location?

If you know the cutoff frequency and its attenuation that is often enough.

On occasion, the phase response will need to be a consideration. If this is the case then the selection of the filter type will need to be carefully chosen.

hgmjr

 

Actually, i need to design an automated software that will design the circuit from the user specification. So how can i calculate the transfer function from the cutoff frequency and its attenuation? My project actually is optimizing the circuit design by using Genetic Algorithm. From my understanding, the generel transfer function of a filter needs the zeros and poles location. But if possible, i dont want the user specify the zeros and poles value..

 

Hi,
See if this helps you

http://www.bessernet.com/articles/lowpfilt/bwfiltstep00.html