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

Current-mode multifunction filter using opamp compensation poles

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 Airline

New current-mode integrator, all-pass section and quadrature oscillator using only active elements

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

New high output-impedance current-mode multifunction filters in a 0.5 mu m CMOS

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

New current-mode integrator and all-pass section without external passive elements and their application to design a dual-mode quadrature oscillator

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

A Resistorless realization of the first-order all-pass filter

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

A new resistorless electronically tunable voltage-mode first-order phase equalizer

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

A versatile active circuit for realising floating inductance, capacitance, FDNR and admittance converter

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

A novel grounded inductor realization using a minimum number of active and passive components

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

Low input impedance trans-impedance type multifunction filter using only active elements

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