The classical approach to arranging an odd-order, low-pass active filter is to place the single pole of the odd-ordered filter at the front-end of the circuit. Following this first stage there are the ...

The idealised graph produced by QUCS for our filter. The filter we’re designing is simple enough, a 5th-order Bessel filter, and the software is the easy-to-use QUCS package on an Ubuntu Linux ...

Although it contains six passive components, the transfer function of the section is fully defined by only two parameters: the resonance frequency F 0 Hz, and the quality factor Q. Therefore, there ...