Qiuzhen Wan

Grid multi-scroll attractors are widely studied in the traditional chaotic systems but are rarely appeared in the neural network systems. This paper proposes a novel method for generating the grid multi-scroll attractors based on a memristive Hopfield neural network (HNN). Firstly, the mathematical model of a simple memristive HNN is developed with...

In this paper, a new method for generating symmetric multi-scroll attractors is proposed based on a magnetized Hopfield neural network (HNN). Firstly, the mathematical model of magnetized HNN by introducing an original memristor to describe the effect of electromagnetic radiation is established, and its dynamic characteristics are analyzed. Then, u...

In this paper, an inductorless and gain-controllable 0.5~2.5 GHz wideband low noise amplifier (LNA) based on second generation current controlled current conveyors (CCCIIs) is presented. The proposed wideband LNA utilizes CCCIIs as building blocks to implement the amplifier stage and impedance matching stage. By varying the DC biasing current of th...

By introducing flux-controlled memristor and linear feedback term into the three-dimensional (3D) chaotic system, and using the state feedback control method to increase dimension, a novel variable-wing 5D memristive hyperchaotic system has been proposed in this paper. The proposed memristive hyperchaotic system has a line equilibrium point whose p...

This paper analyzes the fingerprint characteristics of a memristor model and proves that this memristor model conforms to the definition of generalized memristor. Using this memristor model, a new class of memristive circuit is built. A new memristive system is obtained through the mathematical modeling of the memristive circuit. The equilibrium po...

This paper investigates a Hopfield neural network under the simulation of external electromagnetic radiation and dual bias currents, in which the fluctuation of magnetic flux across the neuron membrane is used to emulate the influence of electromagnetic radiation. Utilizing conventional analytical methods, the basic properties of the proposed Hopfi...

Due to the potential difference between two neurons and that between the inner and outer membranes of an individual neuron, the neural network is always exposed to complex electromagnetic environments. In this paper, we utilize a hyperbolic-type memristor and a quadratic nonlinear memristor to emulate the effects of electromagnetic induction and el...

This paper investigates a Hopfield neural network (HNN) under the simulation of external electromagnetic radiation and dual bias currents, in which the fluctuation of magnetic flux across the neuron membrane is used to emulate the influence of electromagnetic radiation. Utilizing conventional analytical methods, the basic properties of the proposed...

In this paper, a high gain and low noise wideband folded-switching down conversion mixer has been designed. A differential complimentary common source/common gate (CS/CG) hybrid topology is utilized as the input RF transconductor stage, where a transformer is subtly applied to the source nodes of the complimentary CS/CG transistors. With the transf...

In this paper, a novel no-equilibrium 5D memristive hyperchaotic system is proposed, which is achieved by introducing an ideal flux-controlled memristor model and two constant terms into an improved 4D self-excited hyperchaotic system. The system parameters-dependent and memristor initial conditions-dependent dynamical characteristics of the propos...

In this paper, we further study the dynamic characteristics of the Yu–Wang chaotic system obtained by Yu and Wang in 2012. The system can show a four-wing chaotic attractor in any direction, including all 3D spaces and 2D planes. For this reason, our interest is focused on multistability generation and chaotic FPGA implementation. The stability ana...

In this work, a novel 6D four-wing hyperchaotic system with a line equilibrium based on a flux-controlled memristor model is proposed. The novel system is inspired from an existing 5D four-wing hyperchaotic system introduced by Zarei (2015). Fundamental properties of the novel system are discussed, and its complex behaviors are characterized using...

Novel memristive hyperchaotic system designs and their engineering applications have received considerable critical attention. In this paper, a novel multistable 5D memristive hyperchaotic system and its application are introduced. The interesting aspect of this chaotic system is that it has different types of coexisting attractors, chaos, hypercha...

By introducing a flux-controlled memristor with quadratic nonlinearity into a 4D hyperchaotic system as a feedback term, a novel 5D hyperchaotic four-wing memristive system (HFWMS) is derived in this paper. The HFWMS with multiline equilibrium and three positive Lyapunov exponents presented very complex dynamic characteristics, such as the existenc...

Random numbers are widely used in the fields of computer, digital signature, secure communication and information security. Especially in recent years, with the large-scale application of smart card and the demand of information security, the demand for high-quality random number generator is increasingly urgent. With the development of the theory...

A novel high conversion gain, low power, current-mirror-based bulk-driven mixer implemented in a 0.18 \(\upmu \hbox {m}\) CMOS technology is presented in this paper. The architecture of the proposed mixer consists of the four complementary CMOS current-mirrors that are connected to form a double-balanced bulk-driven down-conversion mixer. The radio...

High peak-to-average power ratio (PAPR) of the transmit signal is a major drawback in optical orthogonal frequency division multiplexing (OOFDM) system. In this paper, we propose and experimentally demonstrate a novel hybrid scheme, combined the Huffman coding and Discrete Fourier Transmission-Spread (DFT-spread), in order to reduce high PAPR in a...

In this paper, a very low power modified current-reused quadrature voltage-controlled oscillator (QVCO) is proposed with the back-gate coupling technique for the quadrature signal generation. By stacking switching transistors in series like a cascode, the modified current-reused QVCO can be constructed in a totem-pole manner to reuse the dc biasing...

In order to generate a real four-wing chaotic attractor, a new four-dimensional (4D) smooth quadratic autonomous system which is constructed by a linear controller to a three-dimensional (3D) pseudo four-wing system is proposed in this paper. Some complex dynamical behaviors such as equilibrium points and chaos are investigated and analyzed. The co...

We investigated wavelength conversion for polarization multiplexing signal based on four-wave mixing in a semiconductor optical amplifier. We found that the converted signals endured crosstalk among the pol-muxed channels. We also proposed and demonstrated a wavelength conversion scheme with polarization diversity technique. By utilizing the techni...

In this paper, a novel complementary differential QVCO using back-gate coupling and switched self-biasing techniques is presented. Since the back-gates of the PMOS switching transistors are used as coupling terminals to achieve the quadrature outputs, the proposed circuit has the advantages of no additional noise source and power dissipation in the...

We have proposed a scheme of radio over fiber (ROF) system with octuple optical millimeter-wave (mm-wave) generation transmit orthogonal frequency division multiplexing (OFDM) signal based on odd order sidebands suppression technique and filtering. The transmission performance of the optical mm-wave OFDM signal is theoretically investigated and imp...

A low power and high gain 3.1∼10.6 GHz UWB low noise amplifier (LNA) is presented in this paper. The first stage of the UWB LNA employs a resistive shunt feedback topology in conjunction with a parallel LC load to achieve wideband input matching and low noise figure simultaneously. By incorporating the modified current reused cascade configuration...

A five-term three-dimensional (3D) autonomous chaotic system with an exponential nonlinear term is reported in this paper. Basic dynamical behaviours of the chaotic system are further investigated. Then a new synchronization phenomenon, complete switched modified function projective synchronization (CSMFPS), for this novel five-term chaotic system...

In this paper, a low voltage low power up-conversion mixer, designed in a Chartered 0.18 μm RFCMOS technology, is proposed to realize the transmitter front-end in the frequency band of 2.4 GHz. The up-conversion mixer uses the current mirror topology and current-bleeding technique in both the driver and switching stages with a simple degeneration r...

This paper presents a low voltage highly linear up-conversion mixer for 2.4 GHz IEEE 802.11b WLAN transmitter applications based on a Chartered 0.18 μm CMOS technology. In the proposed mixer, the double balanced Gilbert cell topology was adopted and the dual resistive current-reuse and current-bleeding techniques in both the driver and switching st...

A high linearity and low noise integrated Ultra High Frequency Radio Frequency Identification (UHF RFID) reader receiver front-end, which operates from 860 MHz to 960 MHz and supports the EPCglobal™ Class-1 Generation-2 and ISO-18000-6B/C standards, is presented in this paper. In this design, an I/Q Zero-IF directconversion circuit is used to suppr...

This paper presents a low voltage wideband down-conversion mixer using current-mode approach for multi-standard receivers. The proposed mixer uses a current mirror amplifier with an embedded passive switching core to achieve mixing function, which can combine the advantages of active and passive mixers simultaneously. The mixer is implemented using...

A new low complexity ultra-wideband 3.1–10.6 GHz low noise amplifier (LNA), designed in a chartered 0.18 μm RFCMOS technology, is presented in this paper. The ultra-wideband LNA only consists of two simple amplifiers with an inter-stage inductor connected. The first stage utilizing a resistive current reuse and dual inductive degeneration technique...

A fast-locking frequency synthesizer is designed for single-chip UHF RFID Reader. Different from the traditional UHF RFID frequency synthesizer, the technology of multi-modulus divider (MMD) is adopted here, which greatly reduces the design complexity. More importantly, two inverters and one toggle circuit are added to the output of the multi-modul...

This paper presents a low-voltage low-power current mode transmitter front-end for 2.4 GHz wireless communication applications, which is fabricated in a chartered 0.18-μm CMOS technology. The direct up-conversion is implemented with a current mode mixer employing a novel input driver stage, which can significantly improve the linearity and consume...

In order to decrease the power dissipation and supply voltage, a current mode up-conversion mixer for RF transmitter is proposed in this paper. Different from the traditional Gilbert structure, the mixer replaces the transconductance stage with current mirrors. This method can bring enough conversion gain and high linearity. The way of current blee...

In this paper, a low-voltage low-power up-conversion mixer, designed in the chartered 0.18-mu m RFCMOS technology, is proposed to realize the transmitter front-end in the frequency band of 2.4 GHz. The proposed mixer uses the dual current-reuse and current-bleeding techniques in both the driver and switching stages with a simple impedance degenerat...

In this paper, a low-power up-conversion current-mode mixer, designed in the chartered 0.18-μm RFCMOS technology, is proposed to realize the transmitter front-end in the frequency band of 2.4 GHz. The proposed mixer can convert a 10 MHz intermediate frequency (IF) signal to a 2.4 GHz RF signal, with a local oscillator power of 2 dBm at 2.39 GHz. A...