Firat Kacar

A new DDCC based memristor emulator circuit and its applications

Memristor is a new passive circuit element. The interaction of the memristor with other circuit elements is important for designers. In this paper, new memristor emulator circuit is designed using DDCC (differential difference current conveyor) based on CMOS. It is realized that the proposed emulator causes less complexity compared to other designed emulator circuits. Compatibility of memristor with CMOSs and its operation ability at high frequencies are very important for circuit design based on memristor. The emulator based on CMOS can manage to provide these two fundamental properties successfully. In order to test the proposed emulator, it is connected to memristor with both ways, serial and parallel, than MC circuit is analyzed and results are shown at the end of the paper.

New lossless inductance simulators realization using a minimum active and passive components

In this paper, five new lossless grounded inductance simulators are presented. All proposed inductor simulator circuits employ with only a single Fully Differential Second-Generation Current Conveyor (FDCCII), two resistors and a capacitor are proposed. Moreover, all passive components are grounded therefore the proposed inductance simulator circuits offer ease of integration and tuning advantages with low sensitivities. To demonstrate the performance of the proposed FDCCII-based inductance simulators, we use one of the circuits to construct a current-mode multifunction filter. The proposed inductance simulator circuits and current-mode multifunction filter are simulated with SPICE program. Simulation results are given to verify the theoretical analysis.

Novel Two OTRA-Based Grounded Immitance Simulator Topologies

Three new operational transresistance amplifier (OTRA)-based grounded parallel immitance simulator topologies are presented. The proposed circuits use two OTRAs and require fewer passive components than most of the counterparts in the literature. The performance of the proposed immitance simulators is demonstrated on a fourth-order bandpass filter. PSPICE simulation results are included to verify theory.

Novel grounded parallel inductance simulators realization using a minimum number of active and passive components

In this paper novel lossless and lossy grounded parallel inductance simulators are reported. All grounded inductor simulator circuits employing only a single DXCCII and three passive components are proposed. The proposed topologies realized all grounded parallel inductance variations. To demonstrate the performance of the presented DXCCII based parallel inductance simulators, we used one of the circuits to construct a third order high-pass filter, a voltage-mode band-pass filter and LC oscillator. Simulation results are given to confirm the theoretical analysis. The proposed DXCCII and its applications are simulated using CMOS 0.35@mm technology.

High-Precision Differential-Input Buffered and External Transconductance Amplifier for Low-Voltage Low-Power Applications

Recently, the demand for low-voltage low-power integrated circuits design has grown dramatically. For battery-operated devices both the supply voltage and the power consumption have to be lowered in order to prolong the battery life. This paper presents an attractive approach to designing a low-voltage low-power high-precision differential-input buffered and external transconductance amplifier, DBeTA, based on the bulk-driven technique. The proposed DBeTA possesses rail-to-rail voltage swing capability at a low supply voltage of ±400 mV and consumes merely 62 μW. The proposed circuit is a universal active element that offers more freedom during the design of current-, voltage-, or mixed-mode applications. The proposed circuit is particularly interesting for biomedical applications requiring low-voltage low-power operation capability where the processing signal frequency is limited to a few kilohertz. An oscillator circuit employing a minimum number of active and passive components has been described in this paper as one of many possible applications. The circuit contains only a single active element DBeTA, two capacitors, and one resistor, which is very attractive for integrated circuit implementation. PSpice simulation results using the 0.18 μm CMOS technology from TSMC are included to prove the unique results.

A spiking and bursting neuron circuit based on memristor

In this paper, we propose two emulator circuits. Firstly, we present a novel memristor emulator based on operational transconductance amplifier (OTA) which is different from classical TiO2 memristor. This memristor emulator has a threshold switching mechanism. Secondly, we create a novel neuron circuit using proposed memristor, which is capable of generating spiking and bursting firing behaviors, with a biologically plausible spike shapes. The behavior of this neuron circuit can be adjusted by changing only one external biasing voltage. This neuron circuit mimics the behavior of cortical neurons, such as regular spiking (RS), intrinsic bursting (IB), chattering (CH) and fast spiking (FS). Proposed emulator circuits are compatible with VLSI systems and they can also be implemented by using discrete circuit components for different applications.

A new cmos current differencing transconductance amplifier (CDTA) and its biquad filter application

This paper presents a new high performance current differencing transconductance amplifier (CDTA), a recently reported active element, especially suitable for analog signal processing applications. The proposed CDTA provide high output impedances at port Z and X, excellent input/output current tracking. The proposed CDTA circuit operats at a supply voltages of ± 1.5V. PSPICE simulation results using TSMC 0.35µ CMOS process model are included to verify the expected values. An example application using the proposed transadmittance type biquad filter is also presented. The proposed filter can realize LP, BP, HP, BS and AP filter responses from the same topology. The circuit also requires no component matching conditions.

A new high-performance CMOS fully differential second-generation current conveyor with application example of biquad filter realisation

In this article, a new complementary metal oxide semiconductor (CMOS) high-performance fully differential second-generation current conveyor (FDCCII) implementation is proposed. The presented FDCCII provides high-output impedance at terminals Z+ and Z−, good linearity and excellent output–input current gain accuracy. Also, the proposed FDCCII circuit operates at a supply voltage of ±1.3 V. The applications of the FDCCII to realise voltage-mode multifunction filters are given. Simulations are performed using TSMC CMOS 0.35-μm technology to verify theoretical results.

FDCCII-based electronically tunable voltage-mode biquad filter

In this work, a voltage-mode biquad filter realizing low-pass, band-pass and high-pass characteristics is presented. The proposed filter, which employs two FDCCIIs, two grounded capacitors and two NMOS transistors, provides electronic tunability with the control voltage applied to the gate. NMOS transistors act as linear resistor. Furthermore, the proposed circuit still enjoys realization using a low number of active and passive components, no requirement with the component choice conditions to realize specific filtering functions, high input impedance, and low active and passive sensitivities performance. Simulation results using SPICE program are given to show the performance of the filter and verify the theory. Copyright

A NEW MIXED MODE FULL-WAVE RECTIFIER REALIZATION WITH CURRENT DIFFERENCING TRANSCONDUCTANCE AMPLIFIER

In this paper, a new mixed mode full-wave rectifier which consists of a current differencing transconductance amplifier (CDTA), resistor and two complementary MOS transistor is presented. The proposed circuit is called as mixed mode because it can be used as current-, voltage-, transimpedance- and transconductance-mode rectifier depending on how the resistor is connected to the input or output of the circuit. The presented circuit has an appropriate zero crossing performance, linearity, low component count, and can be adapted to modern IC technologies. It is also suitable for monolithic integrated implementation. LTSPICE simulations with 0.18 μm CMOS model obtained through TMSC are included to verify the workability of the proposed circuit. We also performed noise and Monte Carlo analyses. Various simulation results are presented to show the effectiveness of the proposed circuit.