Third order quadrature oscillator and its application using CDBA

This research article comes with three novel topologies of Voltage Mode (VM) third order Quadrature Sinusoidal Oscillators (QSOs) using Current Differencing Buffered Amplifier (CDBA) as an active device with grounded and virtually grounded passive components. An implementation perspective of the prototype circuits follows a specific class of filter specifically Low pass (LP), High pass (HP) and All pass (AP) including an integrator/ differentiator in a closed loop. To justify the feasibility of the proposed QSO configurations, time response and frequency response outputs are generated through PSPICE simulation using 180 nm CMOS process parameters. In addition, the proposed configurations are experimentally tested using commercially available Current Feedback Operational Amplifier (CFOA) as IC AD844AN for the implementation of CDBA active block that validates the theoretical propositions and computer simulation results. The other performance analysis viz. sensitivity, non-ideality, frequency stability, phase noise analysis and Monte-Carlo analysis are also discussed for the proposed structures. An application workability of the proposed QSOs configuration is used to determine the transmission and reception signal of Quadrature Amplitude Modulation (QAM) and Quadrature Phase Shift Keying (QPSK) techniques.