Abstract
The circuit design solutions of a new subclass of fourth-order notch
filters (NF) are considered, which are implemented on operational
amplifiers by sequentially connecting identical second-order links of
NF. Equations for their main parameters are given. In the Micro-Cap
environment, computer simulation of the amplitude-frequency
characteristics was performed, which shows the possibility of
independent adjustment of the quality factor of the pole, the frequency
of the pole, and the NF transfer coefficient. The proposed circuits
differ in the circuitry of the links, as well as in the ways of
introducing feedback and options for connecting the input signal source.