Electronically tunable third-order dual-mode quadrature sinusoidal oscillators employing VDCCs and all grounded components

摘要

Two new configurations of third-order dual-mode (i.e. both voltage and current mode) quadrature sinusoidal oscillator using a newly reported active block, called the voltage differencing current conveyor (VDCC) have been presented in this manuscript. Both the proposed oscillators employ two VDCCs, three capacitors, and three resistors. The circuits are suitable for integrated circuit (IC) realization as all the passive components used in the circuits are grounded. In addition, the proposed configurations enjoy the following advantages: i) both the frequency of oscillation (FO) and the condition of oscillation (CO) are electronically tunable; ii) tuning of FO and CO are independent to each other; and iii) active and passive sensitivities are low. Non-ideal, parasitic and phase noise analysis of the circuits have been included to strengthen the design idea. PSPICE simulation results using TSMC 0.18 Im CMOS technology are given to verify the theoretical analysis. The operations of the proposed circuits are also verified experimentally wherein VDCC is realized using OPA860 ICs.