The Study of the Stability Response of a Versatile 3rd-Pole Active-OTA Filter for Different Values of Central Frequency fo

The study proposes the stability response of a versatile 3^rd-pole current-mode active-OTA filter for different values of f_0 with Q=10. This paper illustrates a new circuit configuration for realizing the stability response of a versatile 3^rd-pole current-mode active-OTA filter. A new circuit configuration is composed only of three OAs with four dual current output operational transconductance amplifiers (OTAs). The Active-OTA filter can realize various 3^rd-pole current-mode transfer functions low-pass, band-pass, and high-pass in single circuit by suitably adjusting the current output branches. It is observed that, the low-pass filter works and extremely stable only for f_0≥25 kHz with Q=10 and the band-pass filter works and also is asymptotically stable for all values of f_O with Q=10. The high-pass filter works and is extremely unstable for all values of f_O with Q=10.