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MMCC Based Electronically Tunable allpass Filters Using Grounded Synthetic Inductor

Circuits and Systems 2014年第4期5卷 89-97页

作者： Rabindranath Nandi Palaniandavar Venkateswaran Mousiki Kar Department of Electronics & Communication Engineering Heritage Institute of Technology Kolkata India Department of Electronics & Telecommunication Engineering Jadavpur University Kolkata India

New circuit implementations of electronically tunable first and second order allpass filter (AP) structures using a Multiplication Mode Current Conveyor (MMCC) building block are presented. The control voltage (V) of the MMCC tunes the desired phase (θ) while the time constant (τ) is adjustable by a Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA)-based synthetic lossless grounded inductor (L). The circuits are analyzed taking into account the device imperfections which show low active sensitivity features of the designs. The effects of port transfer error (ε) and that of the parasitic capacitances of the active devices had been meticulously examined which indicated that certain deviations in nominal design equations occur;these however, could be minimized with appropriate choice of the circuit passive components. Readily available AD-844 type Current Feedback Amplifier (CFA) elements are utilized for the topology implementation. Satisfactory test results on electronic θ-tunability, upto about 300 KHz, had been verified by PSPICE simulation and with hardware experimentation.

关键词： allpass Filter MMCC DVCCTA CFA Synthetic Inductor Electronic Phase Shifter

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Voltage Mode Cascadable allpass Sections Using Single Active Element and Grounded Passive Components

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Circuits and Systems 2010年第1期1卷 5-11页

作者： Jitendra Mohan Sudhanshu Maheshwari Durg S. Chauhan 不详

In this paper, four new first order voltage mode cascadable allpass sections are proposed using single active element and three grounded passive components, ideal for IC implementation. The active element used is a fully differential current conveyor. All the proposed circuit possess high input and low output impedance feature which is a desirable feature for voltagemode circuits. Nonideality aspects and parasitic effects are also given. As an application, a multiphase oscillator is designed. The proposed circuits are verified through PSPICE simulation results using TSMC 0.35 µm CMOS parameters.

关键词： Analogue Signal Processing allpass Filter Current Conveyor VoltageMode

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Low Input and High Output Impedances Current-Mode First-Order allpass Filter Employing Grounded Passive Components

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Circuits and Systems 2012年第2期3卷 176-179页

作者： Jiun-Wei Horng Chun-Li Hou Yi-Sing Guo Chih-Hou Hsu Dun-Yih Yang Min-Jie Ho Department of Electronic Engineering Chung Yuan Christian University Chung-Li Chinese Taipei

A current-mode low input and high output impedances first-order allpass filter using two multiple output second-generation current conveyors (MOCCIIs), one grounded capacitor and one grounded resistor is presented. The suggested filter uses a canonical number of passive components without requiring any component matching condition. The frequency responses simulation results of the proposed filter confirm the theoretical analysis.

关键词： Second-Generation Current Conveyor First-Order Filter allpass Current-Mode

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