Analog filters are frequency selective circuits that have the role of attenuating or eliminating unwanted spectral components.
The most used types of filters are:
Main filter parameters are:
Fig. 1: Main parameters of a filter
The OA-RC inverting lossy integrator seen in the following figure is used to design the 1st order section of the LPF.
Fig. 2: OA-RC lossy integrator
The transfer function of the OA-RC inverting lossy integrator and its parameters are:
Fig.3 : Implementing the lossy integrator on the Helpkit board
Table 1: Filter’s gain over frequency results
Fig.4: Frequency characteristic of|H|dB for the lossy integrator