Implementing Programmable Bandpass Filters Using XDCPs
A common requirement in many signal processing applications is a bandpass filter network to precondition an input signal to a desired range of frequencies. Traditionally, this circuit has been implemented using basic analog building blocks (e.g. operational amplifiers) in conjunction with fixed resistors and capacitors to set the center frequency (f 0) of the bandpass filter.
The figure below shows a programmable infinite gain multiple feedback (IGMF) bandpass filter. These filters are characterized by a fixed, five component configuration.