Novel Single CDDITA Based Resistively Tunable All-Pass Filter Configuration with Grounded Passive Elements

The design and analysis of a new voltage-mode all pass filter developed using CDDITA (Current Differencing Differential Input Trans conductance Amplifier) along with two grounded resistances and one grounded capacitor has been depicted in this paper. As the detailed literature survey has revealed, proposed all pass filter (APF) configuration is the most compact filter design as compared to any CDDITA based APF presented so far. The proposed configuration has the advantages as; employment of all passive grounded elements, availability of gain control through grounded resistance, low input impedance and high output impedance. For the evaluation of simulation results of the developed configuration the passive component is taken as: R-1= R-2 = 1K Omega, C1=0.1nF with supply voltages +/- 3 V DC and bias current values I-bias=20 mu A. The operability of the circuit has been validated through simulation performed using PSPICE OrCAD 9.1 Version using TSMC technology parameters.