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Abstract
A canonic symmetric notch filter with grounded capacitors is presented. It has independent controls for Q-factor and notch frequency. It also provides low-pass and band-pass response across appropriate ports. An experimental circuit was built and tested for Q-values of 1, 10 and 100 at each of the notch frequencies of 60 Hz, 1 KHz and 5 KHz. There is excellent agreement between calculated and experimental results.