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 ...

Figure 12 Curves for a low Q section of the 7th order 1dB Chebyshev filter. Designing with the spreadsheet. In the spreadsheet, there are a number of instructions alongside each of the graphs to help ...