Design of an Electronically Controlled Biquadratic Filter Using Commercial ICs
Somkid Ritnathikul, Danupat Duangmalai, Khanittha Kaewdang, Settasuk Kwuanphet, Thanawat Chalermpong, Koson Pitaksuttayaprot · 2025
This paper presents an electronically controlled biquadratic filter designed for precise frequency selection in applications such as audio processing, telecommunications, and cochlear implants. The design utilizes AD830, AD844, and LM13700 integrated circuits, facilitating high-pass, band-pass, and low-pass responses with improved stability and real-time tunability. PSPICE simulations validate the filter's adaptability and performance, demonstrating its effectiveness in dynamic environments and its suitability for high-frequency applications requiring flexible frequency control. The results indicate a calculated pole frequency of 2.23 MHz, while simulations yield a slightly lower value of 2.0 MHz, affirming the design's practical viability and alignment with theoretical expectations.