Electronically Tunable Higher-Order Quadrature Oscillator Employing CDBA

Abstract A higher-order Quadrature Sinusoidal Oscillator (QSO) topology using Current Differencing Buffered Amplifier (CDBA) as an active device is investigated. The proposed oscillator produces two sinusoidal variable frequency waveforms with 90° of phase shift and suitable for signal processing applications. An unambiguous electronic control in terms of a performance parameter of oscillator such as the condition of oscillation and frequency of oscillation can be successfully achieved by using grounded and virtually grounded passive components in our proposed quadrature oscillator design. To demonstrate the feasibility of the proposed quadrature circuit, both transient and frequency response outputs are well observed through PSPICE in which CDBA is integrated with 0.18 ​μm CMOS technology parameter. In addition, hardware verification is also executed using commercially accessible Current Feedback Operational Amplifier (CFOA) as IC AD844AN and standard passive components. The other performance analysis such as sensitivity, non-ideality effect, frequency stability, phase noise, temperature analysis and Monte-Carlo analysis are also discussed for the proposed structure. The layout of the proposed configurations is also observed using the Analog Design Environment (ADE) spectra tool provided by Cadence Virtuoso.