Novel Floating General Element Simulators Using CBTA

In this study, a novel floating frequency dependent negative resistor (FDNR), floating inductor, floating capacitor and floating resistor simulator circuit employing two CBTAs and three passive components is proposed. The presented circuit can realize floating FDNR, inductor, capacitor or resistor depending on the passive component selection. Since the passive elements are all grounded, this circuit is suitable for fully integrated circuit design. The circuit does not require any component matching conditions, and it has a good sensitivity performance with respect to tracking errors. Moreover, the proposed FDNR, inductance, capacitor and resistor simulator can be tuned electronically by changing the biasing current of the CBTA or can be controlled through the grounded resistor or capacitor. The high-order frequency dependent element simulator circuit is also presented. Depending on the passive component selection, it realizes high-order floating circuit defining as V(s) = snAI(s) or V(s) = s-nBI(s). The proposed floating FDNR simulator circuit and floating high-order frequency dependent element simulator circuit are demonstrated by using PSPICE simulation for 0.25 μm, level 7, TSMC CMOS technology parameters

Supplementary First-Order All-Pass Filters with Two Grounded Passive Elements Using FDCCII

In this study, two novel first-order all-pass filters are proposed using only one grounded resistor and one grounded capacitor along with a fully differential current conveyor (FDCCII). There is no element-matching restriction. The presented all-pass filter circuits can be made electronically tunable due to the electronic resistors. Furthermore, the presented circuits enjoy high-input impedance for easy cascadability. The theoretical results are verified with SPICE simulations

Guest editorial: special issue on signal processing

It affords us great pleasure to introduce you to a collection of the best 10 invited papers focusing on different areas of signal processing that were originally mainly submitted by young scientists and Ph.D. students and, on a limited scale, presented at the 2011 34th International Conference on Telecommunications and Signal Processing (TSP) held on 18-20 August, 2011, in Budapest, Hungary. Here you can find their extended versions, in which the authors present their research results in more depth and detail. [...

Guest editorial: special issue on signal processing

It affords us great pleasure to introduce you to a collection of the best 10 invited papers focusing on different areas of signal processing that were originally mainly submitted by young scientists and Ph.D. students and, on a limited scale, presented at the 2011 34th International Conference on Telecommunications and Signal Processing (TSP) held on 18-20 August, 2011, in Budapest, Hungary. Here you can find their extended versions, in which the authors present their research results in more depth and detail. [...

Optimized fractional-order Butterworth filter design in complex F-plane

This paper introduces a new technique to optimally design the fractional-order Butterworth low-pass filter in the complex F-plane. Design stability is assured by incorporating the critical phase angle as an inequality constraint. The poles of the proposed approximants reside on the unit circle in the stable region of the F-plane. The improved accuracy of the suggested scheme as compared to the recently published literature is demonstrated. A mixed-integer genetic algorithm which considers the parallel combinations of resistors and capacitors for the Valsa network is used to optimize the frequency responses of the fractional-order capacitor emulators as part of the experimental verification using the Sallen–Key filter topology. The total harmonic distortion and spurious-free dynamic range of the practical 1.5th-order Butterwoth filter are measured as 0.13% and 62.18 dBc, respectively; the maximum and mean absolute relative magnitude errors are 0.03929 and 0.02051, respectively.Publisher's VersionQ1WOS:00085474580000

A special issue on low - voltage low - power analog devices and their applications

It is well known that there is an increasing trend on the design of low-voltage low-power circuits due to the requirement of efficient portable electronic systems with long battery lifetime. For analog circuits, higher biasing current is needed to obtain the same performance with low supply voltages which, however, results in increasing the power consumption. On the other hand, lower biasing current restricts the dynamic range of the circuit, whereas with low supply voltages it is hard to keep all the transistors in saturation region. Thus, design techniques for low-voltage low-power operation are very important for analog circuit designers. In this Special Issue we deal with low-voltage low-power analog devices and their application

High input impedance voltage-mode universal filter and its modification as quadrature oscillator using VDDDAs

The second order universal voltage-mode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltage-mode biquad filter with orthogonal tune of natural frequency and quality factor. The proposed filter simultaneously provides five filter responses: low-pass (LP), high-pass (HP), band-reject (BR), all-pass (AP) and band-pass (BP) in the same circuit topology. The natural frequency and quality factor can be tuned electronically and orthogonally dc bias current. The output impedance at output nodes HP, AP and BR has low impedance which can connect to other circuit without the use of voltage buffers. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded capacitors. This makes the proposed filter suitable for integrated circuit development. With slightly modifying the proposed filter, the voltage-mode qudrature sinusoidal oscillator with low output impedance and independent control of condition of oscillation (CO) and frequency of oscillation (FO) has been achieved. The results shown in this paper are from PSPICE simulation and experiment to validate the proposed circuits

Signal Processing Circuits and Systems for Smart Sensing Applications

The rising demand for reliable, real-time, low-maintenance, cost-efficient monitoring systems with a high accuracy is becoming increasingly more notable in everyday life [...

Voltage-mode universal filters employing single modified current feedback operational amplifier (MCFOA

Abstract This paper deals with the modified current-feedback operational amplifier (MCFOA) that is used in two voltagemode (VM) frequency filters. Both structures presented employ single active and five passive elements. Circuits enable realizing a low-(LP), band-(BP), and high-pass (HP) filter responses without changing the circuit topology. There is no requirement for additional component or rotation of component to realize band-stop (BS) and all-pass (AP) filter function. Moreover, the independent adjustment of the quality factor Q by varying the value of single passive element without affecting of the natural frequency Ȧ 0 is allowed. All the passive and active sensitivities are low. In the PSPICE simulations the BJT simulation model of the MCFOA and its possible realization using the UCC-N1B 0520 integrated circuit are used to confirm the workability of the proposed circuits