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Introducing scalable 1-bit full adders for designing quantum-dot cellular automata arithmetic circuits

Frontiers of Information Technology & Electronic Engineering 2022年第8期23卷 1264-1276页

作者： Hamideh KHAJEHNASIR-JAHROMI pooya torkzadeh Massoud DOUSTI Department of Electrical and Computer Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran

Designing logic circuits using complementary metal-oxide-semiconductor(CMOS)technology at the nano scale has been faced with various challenges *** leakage currents,the short-effect channel,and high energy dissipation are some of the ***-dot cellular automata(QCA)represent an appropriate alternative for possible CMOS replacement in the future because it consumes an insignificant amount of energy compared to the standard *** key point of designing arithmetic circuits is based on the structure of a 1-bit full adder.A low-complexity full adder block is beneficial for developing various intricate *** paper represents scalable 1-bit QCA full adder structures based on cell *** proposed full adders encompass preference aspects of QCA design,such as a low number of cells used,low latency,and small area ***,the proposed structures have been expanded to larger circuits,including a 4-bit ripple carry adder(RCA),a 4-bit ripple borrow subtractor(RBS),an add/sub circuit,and a 2-bit array *** designs were simulated and verified using QCA Designer-E version *** tool can estimate the energy dissipation as well as evaluate the performance of the *** results showed that the proposed designs are efficient in complexity,area,latency,cost,and energy dissipation.

关键词： Quantum-dot cellular automata(QCA) Full adder Ripple carry adder(RCA) Add/sub circuit Multiplier

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An Enhanced Bulk-Driven Folded-Cascode Amplifier in 0.18 µm CMOS Technology

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Circuits and Systems 2012年第2期3卷 187-191页

作者： Arash Ahmadpour pooya torkzadeh Department of Electronic Engineering Islamic Azad University Lahijan Branch Lahijan Iran Department of Electronic Engineering Islamic Azad University Science and Research Branch Tehran Iran

A new configuration of Bulk-Driven Folded-Cascode (BDFC) amplifier is presented in this paper. Due to this modifying, significant improvement in differential DC-Gain (more than 11 dB) is achieved in compare to the conventional structure. Settling behavior of proposed amplifier is also improved and accuracy more than 8 bit for 500 mV voltage swing is obtained. Simulation results using HSPICE Environment are included which validate the theoretical analysis. The amplifier is designed using standard 0.18 μm CMOS triple-well (level 49) process with supply voltage of 1.2 V. The correct functionality of this configuration is verified from –50℃ to 100℃.

关键词： Bulk-Driven Folded-Cascode (BDFC) Amplifier DC-Gain Bulk-Driven (BD) Folded-Cascode (FC) CMOS

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Stochastic Epidemic Model of Covid-19 via the Reservoir-People Transmission Network

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Computers, Materials & Continua 2022年第7期72卷 1495-1514页

作者： Kazem Nouri Milad Fahimi Leila torkzadeh Dumitru Baleanu Department of Mathematics Faculty of MathematicsStatistics and Computer SciencesSemnan UniversityP.O.Box 35195-363SemnanIran Department of Mathematics Faculty of Arts and SciencesCankaya UniversityAnkaraTurkey Institute of Space Sciences Magurele-BucharestRomania

The novel Coronavirus COVID-19 emerged in Wuhan,China in December ***-19 has rapidly spread among human populations and other *** outbreak of COVID-19 has become a global *** models of epidemiological systems enable studying and predicting the potential spread of *** and predicting the evolution of COVID-19 epidemics in near real-time is a scientific challenge,this requires a deep understanding of the dynamics of pandemics and the possibility that the diffusion process can be completely *** this paper,we develop and analyze a model to simulate the Coronavirus transmission dynamics based on Reservoir-People transmission *** faced with a potential outbreak,decision-makers need to be able to trust mathematical models for their decision-making *** of the most considerable characteristics of COVID-19 is its different behaviors in various countries and regions,or even in different individuals,which can be a sign of uncertain and accidental behavior in the disease *** trait reflects the existence of the capacity of transmitting perturbations across its *** construct a stochastic environment because of parameters random essence and introduce a stochastic version of *** we prove the uniqueness and existence of the solution on the stochastic ***,the equilibria of the system are ***,we establish the extinction of the disease under some suitable ***,some numerical simulation and comparison are carried out to validate the theoretical results and the possibility of comparability of the stochastic model with the deterministic model.

关键词： Coronavirus infectious diseases stochastic modeling brownian motion reservoir-people model transmission simulation stochastic differential equation

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