title: Electronically Tunable Differential Integrator: Linear Voltage Controlled Quadrature Oscillator.
abstract: A new electronically tunable differential integrator (ETDI) and its extension to voltage controlled quadrature oscillator (VCQO) design with linear tuning law are proposed; the active building block is a composite current feedback amplifier with recent multiplication mode current conveyor (MMCC) element. Recently utilization of two different kinds of active devices to form a composite building block is being considered since it yields a superior functional element suitable for improved quality circuit design. The integrator time constant (τ) and the oscillation frequency (ω o ) are tunable by the control voltage (V) of the MMCC block. Analysis indicates negligible phase error (θ e ) for the integrator and low active ω o -sensitivity relative to the device parasitic capacitances. Satisfactory experimental verifications on electronic tunability of some wave shaping applications by the integrator and a double-integrator feedback loop (DIFL) based sinusoid oscillator with linear f o variation range of 60 KHz~1.8 MHz at low THD of 2.1% are verified by both simulation and hardware tests.
authors.affiliation: Department of Electronics & Telecommunication Engineering, Jadavpur University, Kolkata 700032, India.
authors.forename: Rabindranath
authors.initials: R
authors.lastname: Nandi
authors.affiliation: Department of Electronics & Communication Engineering, Narula Institute of Technology, Kolkata 700109, India.
authors.forename: Sandhya
authors.initials: S
authors.lastname: Pattanayak
authors.affiliation: Department of Electronics & Telecommunication Engineering, Jadavpur University, Kolkata 700032, India.
authors.forename: Palaniandavar
authors.identifier: 0000-0001-7206-1740
authors.initials: P
authors.lastname: Venkateswaran
authors.affiliation: Department of Electronics Engineering, B. P. P. Institute of Technology, Kolkata 700052, India.
authors.forename: Sagarika
authors.initials: S
authors.lastname: Das