Electronically Controllable Multiple Input Single Output Universal Filter Employing OTAs

This paper presented voltage-mode (VM) universal filter using three operational transconductance amplifiers (OTAs) and two capacitors. The presented filter circuit realize all standard filter responses: low pass filter (LPF), high pass filter (HPF), band pass filter (BPF), band reject filter (BRF) and all pass filter (APF) without varying the circuit structure. The presented circuit having subsequent features: high input impedance, no inversion signal is required. The natural frequency ($\omega_{0}$) and quality factor (Q) can be electronically controllable using transconductance of OTA. The presented circuit having low active and passive sensitivities. The presented circuit viability has been justify by PSPICE simulations (such as AC, Transient and Temperature Analysis simulations) with CMOS OTA implemented in $0.18\mu \mathrm{m}$ technology with voltage supply ±0.9V and power dissipation of 0.675mW.