Electronically Tunable Dual-Input Integrator Employing a Single CDBA and a Multiplier: Voltage Controlled Quadrature Oscillator Design

A new dual-input differential input active integrator using a current differencing buffered amplifier (CDBA) is proposed. A multiplier element is appropriately used in the circuit whose control voltage (Vc) tunes the integrator time constant (τ) electronically. The design of a voltage controlled quadrature oscillator (VCQO) based on the proposed integrator had been satisfactorily implemented. A new type of measurement for the tuning error of the oscillator based on the Nyquist plot is presented that shows an error of only 2% atfo≈1 MHz with Total Harmonic Distortion (THD) less than 3%.

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Electronically Tunable Differential Integrator: Linear Voltage Controlled Quadrature Oscillator

International Scholarly Research Notices ◽

10.1155/2015/690923 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Rabindranath Nandi ◽

Sandhya Pattanayak ◽

Palaniandavar Venkateswaran ◽

Sagarika Das

Keyword(s):

Building Block ◽

Phase Error ◽

Control Voltage ◽

Current Feedback ◽

Quadrature Oscillator ◽

Active Devices ◽

Feedback Amplifier ◽

Current Feedback Amplifier ◽

Electronically Tunable ◽

Double Integrator

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 (ωo) are tunable by the control voltage (V) of the MMCC block. Analysis indicates negligible phase error (θe) for the integrator and low active ωo-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 fo variation range of 60 KHz~1.8 MHz at low THD of 2.1% are verified by both simulation and hardware tests.

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New Realization of Quadrature Oscillator using OTRA

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v7i4.pp1815-1823 ◽

2017 ◽

Vol 7 (4) ◽

pp. 1815 ◽

Cited By ~ 2

Author(s):

Gurumurthy Komanaplli ◽

Neeta Pandey ◽

Rajeshwari Pandey

Keyword(s):

High Frequency ◽

Closed Loop ◽

Harmonic Distortion ◽

Cmos Process ◽

Third Order ◽

Pass Filter ◽

Fully Integrated ◽

Quadrature Oscillator ◽

Electronically Tunable ◽

High Pass

In this paper a new, operational transresistance amplifier (OTRA) based, third order quadrature oscillator (QO) is presented. The proposed structure forms a closed loop using a high pass filter and differentiator. All the resistors employed in the circuit can be implemented using matched transistors operating in linear region thereby making the proposed structure fully integrated and electronically tunable. The effect of non-idealities of OTRA has been analyzed which suggests that for high frequency applications self-compensation can be used. Workability of the proposed QO is verified through SPICE simulations using 0.18μm AGILENT CMOS process parameters. Total harmonic distortion (THD) for the proposed QO is found to be less than 2.5%.The sensitivity, phasenoise analysis is also discussed for the proposed structure.

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Electronically Tunable First Order AP/LP and LP/HP Filter Topologies Using Electronically Controllable Second Generation Voltage Conveyor (CVCII)

Electronics ◽

10.3390/electronics10070822 ◽

2021 ◽

Vol 10 (7) ◽

pp. 822

Author(s):

Gianluca Barile ◽

Leila Safari ◽

Leonardo Pantoli ◽

Vincenzo Stornelli ◽

Giuseppe Ferri

Keyword(s):

Second Generation ◽

Harmonic Distortion ◽

Matching Condition ◽

Cmos Technology ◽

Control Voltage ◽

First Order ◽

Low Pass ◽

Floating Capacitor ◽

Electronically Tunable ◽

Electronically Controllable

In this paper two new first order filter topologies realizing low-pass/all-pass (LP/AP) and low-pass/high-pass (LP/HP) outputs using electronically controllable second generation voltage conveyors (CVCIIs) are presented. Unlike second generation voltage conveyors (VCII), in CVCII each performance parameter, including ports, parasitic impedances, current and/or voltage gains can be electronically varied. Here, in particular, the proposed filter topologies are based on two CVCIIs, one resistor and one capacitor. In the first topology VLP/IAP/VAP and in the second topology ILP/VLP/IHP/VHP outputs are achievable, respectively. However, the current and voltage outputs are not achievable simultaneously and a floating capacitor is used. A control current (Icon) is used to change the first CVCII Y port impedance, which sets the filter −3 dB frequency (F0) of all the outputs. Moreover, in the second topology, the gains of HP and AP outputs are electronically adjusted by means of a control voltage (Vcon). Favorably, no restricting matching condition is necessary. PSpice simulations using 0.18 µm CMOS technology and supply voltages of ±0.9V show that by changing Icon from 0.5 µA to 50 µA, F0 is varied from 89 kHz to 1 MHz. Similarly, for a Vcon variation from −0.9 V to 0.185 V, the gains of IAP and IHP vary from 30 dB to 0 dB and those of VAP and VHP vary from 100 dB to 20 dB. The total harmonic distortion (THD) is about 8%. The power consumption is from 0.385 mW to 1.057 mW.

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Single phase multifunctional integrated converter for electric vehicles

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v24.i3.pp1342-1353 ◽

2021 ◽

Vol 24 (3) ◽

pp. 1342

Author(s):

Kondreddy Sreekanth Reddy ◽

Sreenivasappa B. Veeranna

Keyword(s):

Electric Vehicles ◽

Power Factor ◽

Single Phase ◽

Harmonic Distortion ◽

Total Harmonic Distortion ◽

Complete Analysis ◽

Regenerative Braking ◽

Power Electronic ◽

Power Electronic Converter ◽

A Current

In this paper, a single phase multifunctional integrated converter is proposed for electric vehicles (EVs) with single stage power conversion. The main objective of the proposed topology is to reduce the weight, size, and cost of the power electronic converter system used in EVs compared to the existing topologies that are already available in the industries. The novelty of the proposed topology includes: (i) single converter for charging, propulsion and regenerative braking; (ii) reduction of number of switches to reduce the switching and conduction losses; (iii) improving the efficiency by reducing the value of inductor; (iv) power factor correction for AC grid; and (v) improving the total harmonic distortion of the grid current. The complete analysis of the various modes of operation of the proposed topology is analyzed and implemented through MATLAB/Simulink software simulation and a power factor of 0.9999 and a current total harmonic distortion (THD) of 2.16% is achieved. The proposed topology is also compared with the existing topologies in terms of number of switches, diodes, inductors and capacitors used.

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