This article illustrates a new configuration to realize the stability of third order active-R filter. If the resistive voltage-dividers have high input impedance and low output impedance, the circuit realizes concurrently three transfer functions low-pass, band-pass, and highpass concurrently in single circuit with work at different nodes with gratified results. It observed that, the low-pass filter works for all values of quality factor and is extremely stable only when the quality factor is less or equal to one. Whereas, the band-pass filter works and is asymptotically stable for all values of quality factor. The high pass filter works for all values of quality factor and is asymptotically stable only when the quality factor is less or equal to one. The circuit has also low sensitivity to passive and active elements. From the results, it can be seen that when the quality factor is less or equal to one, the circuit has excellent low-pass performance and highpass performance and for all values of quality factor, the circuit has excellent band-pass performance.

Keywords : Filter; Stability response; Third order; Active-R; Quality factor; OTA, Op-amp.