Hi friends
I need modify (and verify) some low pass active filters, It use one Op.Ampl, but are 4º order, I know they are named Elipthical, or Cauer.
I have diagram (from a magazine) it have 4 capacitors and one Op Amp, but I want modify frequency.
I could not find information about that, all web site only speak about 2º order, or connect two Op Ampl in cascade for get 3º, or 4º order (I do not want adds more IC).
Please if someone can help me. I need formulas, and design criteria.
Regards
Audiofilo
I need modify (and verify) some low pass active filters, It use one Op.Ampl, but are 4º order, I know they are named Elipthical, or Cauer.
I have diagram (from a magazine) it have 4 capacitors and one Op Amp, but I want modify frequency.
I could not find information about that, all web site only speak about 2º order, or connect two Op Ampl in cascade for get 3º, or 4º order (I do not want adds more IC).
Please if someone can help me. I need formulas, and design criteria.
Regards
Audiofilo