This bandpass active filter features adjustable Q and maximum gain in the passband and consists of a twin-T cell with Q adjustment and a differential output stage. You can also extract a frequency-notch output from the voltage-follower stage

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• Article «Bandpass filter features adjustable Q and constant maximum gain»
• Figure 1. This bandpass active filter features adjustable Q and maximum gain in the passband and consists of a twin-T cell with Q adjustment and a differential output stage. You can also extract a frequency-notch output from the voltage-follower stage
• Figure 2. Magnitude and phase Bode plots at the frequency-notch output, V_BR(t), show effects of varying twin-T-cell feedback factor, m, from 0.1 to 0.9
• Figure 3. Magnitude and phase Bode plots at the bandpass output, V_OUT(t), show effects of varying twin-T-cell feedback factor, m, from 0.1 to 0.9