The circuit of an operational amplifier notch filter, using a simulated inductance, is revisited, to reveal its versatility in that, by suitable design and choice of the output point, one can obtain all kinds of filters – all-pass, low-pass, high-pass, band-pass, and band-stop – null as well as notch. Detailed analysis is followed by simulation, to bring out the important characteristics, and considerations in design for a prescribed specification.
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Roy et al. (2024) studied this question.
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