An Electronically Controllable Voltage-mode First-order All-Pass Filter Using Only Single CCCDTA

This article presents a voltage-mode first-order all-pass filter based on merely single current controlled current differencing transconductance amplifiers (CCCDTA). The features of the circuit are that: the pole frequency can be electronically controlled via the input bias current: the circuit description is very simple, consisting of merely single CCCDTA and single capacitor, without any matching condition constraint. Consequently, the proposed circuit is very appropriate to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The power consumption is approximately 1.01 mW at plusmn 1.5 V power supply voltages. The application example as a quadrature oscillator is included.