Active filter design is a mature topic that provides good solutions that can be implemented\nusing discrete devices or integrated circuit technology. For instance, when the filter topologies are\nimplemented using commercially available operational amplifiers (opamps), one can explore varying\ncircuit parameters to tune the central freQuency or enhance the Quality (Q) factor. We show the\naddition of a feedback loop in the signal flow graph of a biQuadratic filter topology, which enhances\nQ and highlights that a sensitivity analysis can be performed to identify which circuit elements\ninfluence central freQuency, Q, or both. In this manner, we show the opamp-based implementation of\na biQuadratic bandpass filter, in which Q is enhanced through performing a sensitivity analysis for\neach circuit element. EQuations for the central freQuency and Q are provided to observe that there\nis not a direct parameter that enhances them, but we show that from sensitivity analysis one can\nidentify the circuit elements that better enhance Q-factor.
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