High-input impedance tunable DDCCTA-based voltage-mode universal filter with grounded capacitors and resistors

A new high-input impedance tunable voltage-mode universal filter using two modified differential difference current conveyor transconductance amplifiers (DDCCTA), two grounded capacitors and three grounded resistors is presented. Because the input impedance of the proposed tunable voltage-mode universal filter is high, the input terminal can be directly connected to the next stage. The proposed circuit simultaneously provides universal voltage-mode lowpass, bandpass, highpass, bandreject and allpass filtering responses, without passive component-matching conditions or restrictions on input signals and enables independent control of the quality factor using single passive element. The use of only grounded capacitors and resistors makes the proposed circuit ideal for integrated circuit implementation. The active and passive sensitivities of the proposed circuit configuration are low. Simulation results verifying the theoretical analysis are also included.