Figure 3. Circuit diagram of the multifunction biquadratic filter : Digitally Reconfigurable Two DVCC Based Biquadratic Analog Filter : Science and Education Publishing
Digital biquad filter - Wikipedia
Applied Sciences | Free Full-Text | Electronically Tunable Current Controlled Current Conveyor Transconductance Amplifier-Based Mixed-Mode Biquadratic Filter with Resistorless and Grounded Capacitors