# frequency transformation bp to lp

#### franticAAC

Joined Jun 25, 2012
30
hi i've to design a bandpass active filter of 6th order PRB type, but i've a problem in the design procedure.
In order to obtain the desired filter i need to convert the bandpass transfer function in a lowpass transfer function.

Given:
$$H(s)=K0*\frac{B0 + B1*T(s) + B2*T^2(s) + B3*T^3(s)}{1 + F2*T^2(s) + F3*T^3(s)}$$

with: $$T(s)=\frac{k}{k+s}$$

what are the step formulas in order to obtain the lowpass transfer function H(s)?

#### Audioguru

Joined Dec 20, 2007
11,251
What is "PRB"?
Please write in full English words without abbreviations.

#### franticAAC

Joined Jun 25, 2012
30
What is "PRB"?
Please write in full English words without abbreviations.
primary_resonator_block

#### Audioguru

Joined Dec 20, 2007
11,251
Thank you for telling its name.
Homework?