Four OTA-Based Mixed-Mode Filter Configuration And Quadrature Voltage Mode Sinusoidal Oscillator

Operational transconductance amplifiers (OTAs) based mixed-mode biquad filter configuration employing four OTAs has been presented in this paper. The circuit utilizes canonic number of grounded capacitors (02), which is eminently suitable for IC fabrication. The proposed biquad structure has orthogonal tunability of pole frequency (ω), pole quality factor (Q) and bandwidth (BW). A sinusoidal oscillator with quadrature outputs is also realizable from the voltage mode filter topology with electronic adjustment of condition of oscillation (CO) and frequency of oscillation (FO). Various simulation results using CMOS OTA with 0:18µm CMOS technology parameters have been included to confirm the validity of the presented circuits.