All-pass filter application using electronically tunable DDCC

In this study, an electronically tunable differential difference current conveyor is presented. The benefits of this new active element are demonstrated on tunable first-order voltage-mode all-pass filter employing a resistor and a capacitor. In the proposed filter structure using single active and two passive elements no element-matching restriction is required. The theoretical results are verified with SPICE simulations using TSMC 0.35 μm CMOS process parameters and with ±2.5 V supply voltages.