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In this article a dual output filter synthesis topology is proposed using a negative impedance converter (NIC) and the minimum number of passive components. Different from the preceding NIC based synthesis methods, the proposed circuits allow passive element matching to reduce the number of passive elements. The proposed dual output topology can simultaneously provide all-pass, notch/high-pass or notch/low-pass filter configurations. Also, the proposed filters have a pole frequency independent of the voltage and current gain deviations of the active element, so it is suitable for pole frequency sensitive applications. Simulations, including a post-layout simulation, Monte-Carlo analysis and Routh-Hurwitz stability tests are performed to verify the theoretical results.

Operational transconductance amplifiers (OTAs) are widely used in the design of electronically tunable circuits. However, electronic tunability ranges of the OTA based filters are restricted by the limited bandwidth of the transconductance gain of the OTA. Furthermore, stability conditions and the linearity of the OTA which depends on the control current restrict the tunability. In this paper, some trade-offs in the electronically tunable filters are investigated. In addition, the tunability ranges of some first and second order OTA-C and OTA-RC filters are comparatively examined. Moreover, an OTA-C all-pass filter circuit is presented. SPICE simulations are performed and stability analyses are given for both of the OTA-C and OTA-RC filters. Operation of the presented all-pass filter is verified experimentally.

In this paper, a new simulated inductor employing two resistors, one capacitor, and only a single gain-variable third-generation current conveyor (GVCCIII) is proposed. To exhibit the performance of the proposed simulated inductor, it is used in a parallel R-L-C current-mode filter. The frequency-dependent nonideal voltage gain effects of the GVCCIII on the proposed inductor are given. The low- and high-frequency limitations of the simulated inductor are investigated in detail. The simulations performed with the SPICE program agree with the theoretical analysis. Also, the proposed circuit is tested experimentally using commercially available active devices (AD844 ICs of Analog Devices) to confirm the theory.

In this paper, a novel second-order voltage-mode filter with single input and six outputs employing inverting second-generation current conveyors (ICCIIs) is presented. This filter simultaneously realizes negative and positive gain lowpass, bandpass, and highpass filter responses, and does not require active and passive element matching. The new filter has low active and passive element sensitivities, and offers orthogonal control of the angular resonance frequency (omega(O)) and quality factor (Q).

In this paper, a new trans-impedance mode single-input-three-output (SITO) filter using opamp compensation poles is presented. The proposed circuit is composed of two internally compensated operational amplifiers (OAs) and four single-output operational transconductance amplifiers (OTAs), without using any external passive elements. The proposed multifunction filter can realize lowpass, bandpass and highpass responses simultaneously all at low output impedances. No matching condition is required. The circuit is suitable for monolithic implementation either with complementary metal oxide semiconductor (CMOS) or bipolar technologies. All of active sensitivities are low. The performance of the circuit is tested using SPICE simulation program.

yayıncısurumuyok# ; Tam metin hakemden geçmiş kopyadır. In this paper, a new configuration suitable for realization of differential input-differential output first order, second order all-pass and notch filters with high CMRR is given. The proposed configuration uses two negative type second-generation current conveyors (CCII-), and three admittances. Two first order and one second order all-pass filters and a notch filter (tunable if current controlled conveyor CCCII is used) are extracted from the proposed configuration. Tracking error, element mismatch, sensitivity analysis, simulation and experimental results are included.

In this paper a new trans-impedance mode multifunction filter using only active elements is presented. The proposed circuit is composed of three internally compensated operational amplifiers (OAs) and three single-output operational transconductance amplifiers (OTAs), without using any external passive elements. The proposed multifunction filter can realize lowpass, bandpass and highpass responses simultaneously. No matching condition is required. The circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performance of the circuit is tested using SPICE simulation program.

In this paper a new current-mode integrator and a first order all-pass section are used to construct a quadrature oscillator. These circuits are composed of operational amplifiers (OAs) and operational transconductance amplifiers (OTAs), without using external passive elements. The proposed circuits are suitable for monolithic implementation either with CIVICS or bipolar technologies. All active sensitivities are low. The performances of the circuits are tested using a SPICE simulation program.

In this paper new voltage-mode and current-mode multifunction filters using internally compensated operational amplifiers (OP-AMPs) and single output operational transconductance amplifiers (OTAs) are presented. The proposed voltage mode multifunction filter can realize lowpass, bandpass, highpass responses simultaneously and the current-mode multifunction filter can realize lowpass, bandpass, highpass and bandstop responses simultaneously all at high output impedances. No external passive elements are required thus the circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performances of the circuits are tested using SPICE simulation program.

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 applications

Minaei, Shahram (Dogus Author) -- Full conference title: 2009 Joint IEEE North-East Workshop on Circuits and Systems and TAISA Conference : (NEWCAS-TAISA 2009) ; Toulouse, France, 28 June - 1 July 2009 A high performance CMOS current differencing buffered amplifier (CDBA) is presented in this paper. The proposed circuit operates with the power supplies of plusmn0.75 V and consumes low power. HSPICE simulations show that the proposed CDBA provides better performance in nearly all parameters than the previous ones. As an application example, a second-order notch filter is chosen from the literature to demonstrate the performance of the proposed circuit.

The signal handling capability of the filters is called dynamic range. In this paper, a topological form for the synthesis of filters with high dynamic range is proposed. A biquad notch/all-pass filter is shown in conformity with the given topological form. It is shown that there is a trade-off between dynamic range and high input impedance property. The presented circuit is compared with other notch filters in the literature. It has less number of components, better high-frequency response and dynamic range compared to others. Since the circuit includes a minimum number of resistors, it can easily provide electronically tunable circuits through resistor/controlled current conveyor replacement. Simulations are performed to verify the theoretical results. Routh-Hurwitz stability analyses are also given.

Analog circuit desioners have usually focused on the design of circuits employing a minimum number of components, occupying less area and dissipating less power. However, some important issues such as signal limitations and especially stability problems of the analog circuits have not received considerable attention in the literature. Hence, the work described in this paper deals with the stability problems of two new current-mode analog filters employing multiple output current controlled conveyors (MOCCCIIs). Toward that end, a single pole model is replaced for each non-ideal current gain of the MOCCCIIs. Both of the novel universal current-mode active-C filters can simultaneously realize low-pass, band-pass and high-pass/notch filter responses. SPICE and MATLAB simulation results are given to verify the theoretical analysis. (C) 2006 Elsevier GmbH. All rights reserved.

A universal current-mode active-C filter simultaneously realizing low-pass, band-pass and high-pass responses is proposed. The filter can also realize notch and all-pass responses with interconnection of relevant output currents. The presented filter employs four second-generation current controlled conveyors (CCCIIs) as active elements and only two capacitors as passive elements. The proposed active-C filter can be tuned electronically, and has low element sensitivities.

In this work, a new multi-input single-output voltage-mode filter realizing low-pass, band-pass, high-pass, notch and all-pass characteristics depending on the input signal selections is presented. The filter employs minimum number of passive elements, and does not need passive element matching. The presented filter has adjustable angular resonance frequency and quality factor, and low active and passive element sensitivities.

In this paper, a voltage-mode full-wave rectifier employing plus-type second-generation current conveyors (CCII+s) and enhancement-mode n-channel metal-oxide semiconductor field-effect transistors (MOSFETs) is proposed. The presented circuit requires no passive components, and is suitable for high frequency applications. The proposed full-wave rectifier circuit is simulated using HSPICE to verify the theoretical analysis.

In this paper, new floating immittance function simulators employing second-generation current controlled conveyors are proposed. The first four of the presented circuits employ only a single grounded capacitor as passive component and can realize either a negative or a positive floating inductor or capacitor. The last two of the proposed circuits do not employ passive components and can realize either negative or positive floating resistances. All of the proposed circuits do not require passive element matching. As an application, a third-order butterworth filter is realized using the proposed positive floating inductance simulator. SPICE simulation results and large signal behavior of the filter are included.

An active circuit suitable for realizing floating inductance, capacitance, FDNR and admittance converter depending on the selection of passive elements of the circuit is presented. The proposed circuit employs only two dual output second-generation current conveyors (DO-CCIIs) and does not require passive element matching. The proposed network has a grounded capacitor for the floating inductance and capacitance simulation. Frequency performance of the circuit is tested using SPICE.

In this paper, new circuits for realizing current-mode and voltage-mode proportional plus integral plus derivative (PID) controllers, proportional plus integral (PI) and proportional plus derivative (PD) controllers employing only plus-type second-generation current conveyors (CCII+s) as active elements are presented. All of the proposed PID, PI and PD controllers have unmatched passive elements, all of which are grounded. The proposed controllers employ reduced number of active and passive components with respect to traditional op-amp based PID, PI and PD controllers. In particular, the proposed current-mode and voltage-mode PD and PI controllers employ minimum number of active and passive components. A closed-loop control system employing the proposed current-mode PID controller is designed and simulated using SPICE.

A new circuit employing second-generation current conveyors (CCIIs), and unmatched resistors for converting a grounded immittance to the corresponding floating immittance with either positive or negative adjustable multiplier, is presented. Moreover, the proposed circuit can also realize a synthetic floating inductance employing a grounded capacitor depending on the passive element selection. Simulation results using 0.35 mu m TSMC CMOS technology parameters are given.

All-pass filters are widely used to shift the phase of an analog signal without altering its magnitude. In this study, a new realization of all-pass filter using one current controlled conveyor (CCCII), one operational amplifier (OP-AMP) and two capacitors is presented. The proposed circuit does not use any resistors thus it is suitable for easy integration. Also the pole frequency of the proposed circuit can be tuned electronically. Simulation results are included to verify theory.

In this paper, a floating inductance and frequency-dependent negative resistance (FDNR) depending on the passive element selection is presented. The proposed circuit employs only plus-type second-generation current conveyors (CCII+s) as active elements, together with two resistors and two capacitors for realizing floating inductance and FDNR. Both of the capacitors in the floating inductance realization are grounded. Also, electronically tunable floating FDNR is obtained with the proposed circuit. The nonideality effects of the current conveyors on the proposed circuit are given. The proposed circuit is used in a low-pass ladder filter, and simulated with SPICE to exhibit its performance.

In this paper, a new active circuit for realizing lossless floating inductor using current controlled conveyors (CCCIIs) and single capacitor is presented. The proposed inductance simulator can be tuned electronically by changing the biasing currents of the CCCIIs. As an application, the proposed floating inductance simulator is used to construct a fifth-order low pass filter. The theoretical analysis is verified by SPICE simulation results.

In this study, we present a new topology for realizing a grounded inductor employing only a single current conveyor, called a negative-type modified inverting second-generation current conveyor (MICCII-), and a minimum number of passive components, two resistors, and one capacitor. The non-ideality effects of the MICCII- on a simulated inductor are investigated. To demonstrate the performance of the presented inductance simulator, we use it to construct a third order Butterworth high-pass filter and a parallel resonant circuit. Simulation results are given to confirm the theoretical analysis.

This paper presents new circuits for realizing both current-mode and voltage-mode proportional-integral- derivative (PID), proportional-derivative (PD) and proportional-integral (PI) controllers employing second- generation current conveyors (CCIIs) as active elements. All of the proposed PID, PI and PD controllers have grounded passive elements and adjustable parameters. The controllers employ reduced number of active and passive components with respect to the traditional op-amp-based PID, PI and PD controllers. A closed loop control system using the proposed PID controller is designed and simulated with SPICE. I. INTRODUCTION The proportional-integral-derivative (PID), proportional- integral (PI) and proportional-derivative (PD) controllers with adjustable parameters are widely used in many industrial control systems, and usually have been implemented with operational amplifiers (op-amps). PID controller realizations using op-amps employ excessive number of active and passive components. Current conveyors, especially plus-type second-generation current conveyors (CCII+s) have larger bandwidth and dynamic range, and also greater linearity than op-amps (1). Employing only CCII+s simplifies the configuration thus gyrator (2), synthetic floating inductances (3-4), voltage- mode filter (5) and transfer function synthesis (6-7) employing only CCII+s have been reported in the literature. Despite of several circuits such as derivative, integral, proportion and summer constructed with op-amps (8-9) that can be used to implement PID, PI and PD controllers, current conveyors have not been used to realize PID, PD and PI controllers in the literature so far. In this paper, novel current-mode and voltage-mode PID, PI and PD controllers employing CCII+s as active elements are proposed. In the proposed current-mode controllers, output currents are taken from high impedance terminals of the CCII+s. Also input voltages are applied to the Y-terminals of the CCII+s in the presented voltage- mode PID, PI and PD controllers. These properties make the proposed circuit ideal for using in cascaded systems. All the proposed controller realizations employ only grounded passive components, and do not require passive element matching so the circuits are suitable for integration. The PID, PI and PD parameters can be selected independently. Also simulations are performed using SPICE program to verify the theoretical analyzes.

Minaei, Shahram (Dogus Author) A second-order multifunction voltage-mode filter with three inputs and one output, is discussed. The filter uses a novel current conveyor called balanced dual input-dual output current conveyor and minimum number of passive elements. Also the filter does not require passive element matching. The parameters angular resonance frequency and quality factor can be adjusted by changing the values of the resistors orthogonally.

A new realization of floating inductance and two R-L impedance simulators are presented, respectively employing three and two first generation current conveyors (CCI)s as active elements. All of the circuits use only plus type (CCI+)s and minimum number of passive elements. The circuits do not require component matching. The performances of the circuits are tested using SPICE simulation program.

Phase equalizers also called all-pass filters are widely used to shift the phase of an analog signal without altering its magnitude. In this study, a new realization of phase equalizer using one current controlled conveyor (CCCII), one operational amplifier (op-amp) and two capacitors is presented. The proposed circuit does not use any resistors thus makes it suitable for integration. Also the pole frequency of the proposed circuit can be tuned electronically. Simulation results are included to verify theory.

In this paper new active only current-mode integrator and differentiator with electronically tunable time constants are described. They are composed of one operational amplifier (OA) and two operational transconductance amplifiers (OTAs), and are suitable for monolithic implementation either with CMOS or bipolar technologies. No realizability conditions are imposed for the proposed circuits and all of the active sensitivities are low. The performances of the circuits are demonstrated on the PSPICE platform.

Telif hakkı yayıncıya ait. Construct a quadrature oscillator. These circuits are composed of operational amplifiers (OAs) and operational transconductance amplifiers (OTAs), without using external passive elements. Also as an application these circuits are used to construct a sinusoidal quadrature oscillator. The proposed circuits are suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performances of the circuits are tested using PSPICE simulation program.

In this paper a new floating inductance simulator employing only active elements is proposed. The proposed circuit uses one internally compensated operational amplifier and one dual output current controlled conveyor (CCCII). The simulated inductance value can be controlled electronically by adjusting the bias current of the CCCII. No component matching constraints are imposed for the simulator and all active sensitivities are low. The performance of the circuit is demonstrated on a fourth-order elliptic filter using a SPICE simulation program

In this paper two new current-mode multifunction filters are presented. The proposed circuits are composed of two internally compensated operational amplifiers (OAs) and three dual-output operational transconductance amplifiers (OTAs), without using external passive elements. Each proposed multifunction filter can realize band-pass, bandstop, and lowpass or highpass responses simultaneously all at high output impedances. No matching conditions are required. The circuits are suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performances of the circuits are confirmed through a SPICE simulation program using the model parameters of 0.5 mum MIETEC CMOS technology.

Telif hakkı yayıncıya ait. In this paper a new trans-impedance mode multifunction filter using opamp compensation poles is presented. The proposed circuit is composed of two internally compensated operational amplifiers (OAs) and four single-output operational transconductance amplifiers (OTAs), without using any external passive elements. The proposed multifunction filter can realize lowpass, bandpass and highpass responses simultaneously. Lowpass and bandpass responses have low output impedances. No matching condition is required. The circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of the active sensitivities are low. The performance of the circuit is tested by using SPICE simulation program. IEEE

In this paper a new current-mode multifunction filter using opamp compensation poles is presented. The proposed circuit is composed of two internally compensated operational amplifiers (OAs) and five single output operational transconductance amplifiers (OTAs), without using external passive elements. The proposed multifunction filter can realize lowpass, bandpass, highpass and bandstop responses simultaneously all at high output impedances. The circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performances of the circuits are tested using SPICE simulation program. IEEE CAS Soc; Univ Zagreb, Fac Elect Engn & Comp; Portland State Univ, Elect & Comp Engn Dept; IEEE Reg 8; Croatian Acad Sci & Arts; Ericsson; IBM; HP Invent; Hrvatski Telekom; Croatia Airlines

In this paper a new configuration for the realization of first-order current-mode all-pass filters with high output impedance is presented. It can realize first-order allpass filtering function using two current controlled conveyors (CCCIIs) connected to four RC one-part elements. Eight different realizations for the proposed configuration are given in tabular form, which exhibit identical transfer functions but differ in the number of passive Components, component matching constraints possibility of electronically gain adjustment and other properties. PSPICE simulation results are given to confirm the theoretical analysis. IEEE; Agcy Natl Reglementat Telecommun; Minist Enseignenment Super Rech Sci; Secretatiat Etat Aupres Minist Enseignement Super Rech Sci Charge Rech Sci; SEPTI; CNRST; Rectorat Univ Mohammed V-Agdal; Sicotel; Silvaco Data Syst; STMicroelectr; Mentor Graph; Commune Agda/Ryad; Off Natl Eau Potable; Barid El Maghreb