(b) The biquadratic second-order section. If the biquadratic filter is tuned by adjusting the two resistors /?, then Q is
proportional to ωc. This provides a constant bandwidth response. Owing to the input point chosen, the biquadratic filter
has no high-pass output, but on-tune band-pass gain is independent of frequency.
(c) Vector diagrams at ω = ωc for the biquadratic section.
Active signal ...
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