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ZrO2-based resistive random access memory devices composed of a thin Cu doped ZrO2 film sandwiched between an oxidizable top electrode and an inert bottom electrode are fabricated by e-beam evaporation at room temperature. The devices show reproducible nonpolar resistive switching. The formation and annihilation of localized conductive filaments is suggested to be responsible for the resistive switching...
Memristor has been extensively investigated as the fourth fundamental circuit element. A common material in fabricating memristors is titanium oxide. The growth of titanium oxide has so far been focused on atomic layer deposition or sputtering, which is expensive. In this paper, a low-cost memristor device is demonstrated based on titanium oxide, grown by the thermal oxidation of deposited Ti film...
This paper presents the design and analysis of a reconfigurable dual-band down-conversion mixer for IMT-Advanced (3.4~3.6 GHz) and UWB (4.2~4.8 GHz) applications. The proposed mixer is based on folded double-balanced Gilbert cell which is well-known for its low voltage, simplicity and well-balanced performances. The mixer adopts capacitive cross-coupling technique for input matching and performance...
A reconfigurable dual-band low noise amplifier (LNA) for 3.4-3.6 GHz IMT-Advanced and 4.2-4.8 GHz UWB systems is presented in this paper. Two different input matching networks with source-inductive-degeneration cascode configuration are used to switch at two different frequency bands. The parallel capacitors between the input MOSFETs' gate and source are used to optimize noise factor of the LNA. The...
This paper presents a dual-band CMOS LC voltage controlled oscillator (VCO) with a switched current source for 3.4-3.6 GHz IMT-Advanced and 4.2-4.8 GHz UWB applications. To accomplish dual-band operation, reconfigurable LC tank is adopted, and a switched current source has been used to guarantee robust start-up condition. Bias filters are used in VCO to suppress reference current noise and dynamic...
Recently, both research-and-education networks (RENs) and commercial networks have added a dynamic circuit service. With this service, users can request and obtain dedicated bandwidth for short durations (on the order of minutes to hours). Host-to-host (cluster-to-cluster) circuits are used for large file transfers. The network nodes used for this circuit service are not pure TDM or WDM circuit switches;...
On the basis of singular systems, the consensus problem for networks of agents with external disturbances and model uncertainty is investigated in this paper. Systems with time delay on both fixed and switching topologies are discussed. Using singular Lyapunov functions and Riccati inequalities, some robust consensus criteria for networks of agents are established.
This paper deals with the problem of measurement feedback impulsive control for synchronization of uncertain delayed stochastic complex networks with switching topologies. The network topology consists of r modes and switches from one mode to another according to a Markovian chain. The parametric uncertainties are assumed to be of a linear fractional form. Based on the Lyapunov functional method and...
High-energy switch and trigger systems are required for a range of capacitor bank applications such as for electromagnetic rail, coil, and electro-thermal guns. This paper summarizes recent developments in this kind of switch design in our laboratory. The switch is a two-electrode switch and is triggered by an overvolting “series-injection” of a high-voltage pulse,elimination of the trigger electrode,...
In many real-world communication systems, the channel noise is non-Gaussian due to the presence of impulsive noise as well as the background Gaussian noise. In such situations, the conventional Euclidean distance based decoder may suffer from the problem of severe metric mismatch. To overcome the problem, we recently proposed the joint erasure marking and Viterbi algorithm (JEVA) as a robust trellis...
A secure mobile communication approach is proposed in this paper. The security of our approach is guaranteed by certification authority and information hiding technique. During the communication, the identity of users will be validated first. The secure speech will be transferred hidden in the public speech. When the public speech arrives at the receiving side, the secure speech will be restored....
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