Electronically Tunable Differential Integrator: Linear Voltage Controlled Quadrature Oscillator. (19th April 2015)

• Record Type: Journal Article
• Authors: Nandi, Rabindranath; Pattanayak, Sandhya; Venkateswaran, Palaniandavar; Das, Sagarika
• Other Names: Gift Stephan Academic Editor.
• Is Part Of: International scholarly research notices. Volume 2015(2015)
• Publication Date: 2015-04-19
• Subjects: Medical sciences -- Periodicals; Life sciences -- Periodicals; Medicine -- Periodicals; Science -- Periodicals; Biomedical Technology; Biological Science Disciplines; Medicine; Life sciences; Medical sciences; Medicine; Science; Periodical; Periodicals; Fulltext; Internet Resources; Periodicals; Electronic journals
• DOI: 10.1155/2015/690923
• Languages: English
• ISSNs: 2356-7872

Abstract

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 activeω 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 linearf o variation range of 60 KHz~1.8 MHz at low THD of 2.1% are verified by both simulation and hardware tests.