Design of multi-functional KHN filter with four OPs
Ying Shang · Electronic Design Engineering · 2010
A new multifunctional second-order filter based on OPs was presented by MASON formula.Functions,such as high-pass,band-pass,low-pass filtering,can be realized respectively and simultaneously,and can become a quadrature oscillator by modifying resistance ratio.Its pole angular frequency and quality factor can be tuned accurately and independently.The circuit presented contains four OPs,two capacitors,and eleven resistances,and inverting input of all OPs is virtual ground.Its general filtering,the independent control of pole frequency and quality factor and quadrature sinusoidal oscillation were simulated by computer,and the result shows that the presented circuit is valid and effective.