Memristor Logic versus TTL Logic: A Comparative Design Analysis and Validation

High speed, cost effective, low power, and high density non-volatile memory devices aids as driving force to carry out research in the field of solid state non-volatile memories. Memristor (Memory-Resistor) is a new category of non-CMOS non-volatile memory whose functional operation is manifested itself as the movement of ionic defects in the lattice of a crystalline material. As the name “Memory Resistor” implies that it is a non-volatile random access memory (NVRAM) i.e. it does not lose its data even when the power is switched-off. In this paper, a new model called Voltage Threshold Adaptive Memristor (VTEAM) model is presented in the context of analysing the logic gates made of Memristors .This paper focuses on the parametric variation of the VTEAM model and also on the implementation of the basic logic gates using Memristors as the basic component. On the basis of simulation results, it is observed that the device shows better accuracy and also faster read operation compared to TTL counterpart. As a case study, NAND and XOR gates are implemented and teste

Design of Monolayer Porous Carbon-Embedded Hybrid-LiMnPO4 for High Energy Density Li-Ion Capacitors

A new insertion type electrode namely olivine LiMnPO4 (LMP) was identified and examined as a candidate electrode for Lithium Ion hybrid capacitors (LIC). Adapting a simple CVD concept, nano-crystallites of LiMnPO4 (LMP) were coated with carbon monolayers of similar to 2 nm thick to circumvent its poor intrinsic electronic conductivity. The novelty is that the individual crystallites of LMP the so-called nC-LMP were perfectly covered with carbon ring and networked to the neighboring crystallites via the continuous carbon wire-like connectivity as revealed by HRTEM analysis. Single electrode Faradic capacitance of 3025 Fg(-1) was deduced for carbon coated LMP, the highest reported hitherto in Li+ aqueous electrolytes. Employing carbon coated LiMnPO4 as working electrode against activated carbon (AC) counter electrode, we obtained a high specific energy of 28.8 Whkg(-1) with appreciable stability in aqueous electrolytes. Accordingly, a full cell version AC vertical bar Li+vertical bar nC-LMP, demonstrated a facile cycling characteristics via removal/insertion of Li+ within LiMnPO4 (positive electrode) and the electrosorption of Li+ into AC having mesoporosity (negative electrode). This demonstrates a battery-like charging and EDLC-like discharging characteristics of hybrid electrochemical capacitors (HECs) as expected

Effect of carbonaceous support between graphite oxide and reduced graphene oxide with anchored Co3O4 microspheres as electrode-active materials in a solid-state electrochemical capacitor

Hydrothermally synthesized CoO microspheres were anchored to graphite oxide (GO) and thermally reduced graphene oxide (rGO) composites at different cobalt weight percentages (1, 10, and 100 wt%). The composite materials served as the active materials in bulk electrodes for two-electrode cell electrochemical capacitors (ECCs). GO/CoO–1 exhibited a high energy density of 35 W kg with a specific capacitance (C) of 196 F g at a maximum charge density of 1 A g. rGO/CoO-100 presented high specific power output values of up to 23.41 kW h kg with linear energy density behavior for the charge densities applied between 0.03 and 1 A g. The composite materials showed Coulombic efficiencies of 96 and 93 % for GO/CoO–1 and rGO/CoO–100 respectively. The enhancement of capacitive performance is attributed to the oxygenated groups in the GO ECC and the specific area in the rGO ECC. These results offer an interesting insight into the type of carbonaceous support used for graphene derivative electrode materials in ECCs together with CoO loading to improve capacitance performance in terms of specific energy density and specific power. [Figure not available: see fulltext.]This work was supported by the Consejo Nacional de Ciencia y Tecnología (Mexico) CB 2011-166356 project fund. The authors would like to thank PRODEP for the support provided throughout the UQROO/DGIP/003/16 project; Consejo Nacional de Ciencia y Tecnología student grant (362308), and the CICY student exchange program. V.P., also acknowledges the technical support for characterization from M. Bass- López (CICY), I. Muñoz, J. Gómez, P. González, and E. Benito (ICTP).Peer Reviewe