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This paper reports a 3.0 THz detector which can detect the terahertz wave radiated by a quantum cascade laser (QCL) working at pulse mode. The detector was implemented in a 65 nm silicon CMOS process. The chip size is 1.5×l.5 mm2 including bonding pads. THz detector using FET is based on plasma wave theory proposed by Dyakonov and Shur which allows detection of THz radiations far beyond the FET devices...
A four-switch three-phase (FSTP) rotor-side converter (RSC) is proposed in this paper for doubly-fed induction generator based wind turbines (DFIG-WT) to increase the system reliability. The proposed converter topology has satisfactory robustness to open-circuit faults, and it is demonstrated to be feasible under the circumstance of wind speed change. According to different current flow directions,...
Resistive Random Access Memory (RRAM) can be regarded as a promising candidate on the manipulation of both electrical and magnetic properties. There is a widespread concern about the electrical manipulation of magnetic properties in RRAM devices. In our work, Co/HfO2/Pt RRAM device with magnetic conductive filament (CF) is designed and fabricated. Then the anisotropic magnetoresistance (AMR) effect...
This paper aims to improve the fault-tolerant ability of doubly-fed induction generator based wind turbines (DFIG-WTs) by applying a four-switch three-phase (FSTP) topology based grid side converter (GSC). Once a switch breaks down in the three-phase GSC, the corresponding phase is connected to the midpoint of the DC bus to make the wind turbine (WT) continue working properly. The operation of the...
Ever since Chinese electric power reform in 2002, different live test approaches were introduced and applied in relative industries. There were at least 26 live test approaches applied in the field of power transformation, power transmission and power distribution. The essay introduced a comprehensive dynamic and flexible effectivity evaluation system, which helped to evaluate the strengths and weaknesses...
Code-reuse attack is a growing threat to computing systems as it can circumvent existing security defenses. Fortunately, control flow integrity (CFI) is promising in defending such attack. However, former implementations generally suffer from two major drawbacks: 1) complex pre-processing to obtain control flow graph; 2) high overhead. In this paper, we propose a cross-layer approach that employs...
A comparator-based current mode control buck-boost DC-DC converter with low transition noise full-wave current sensor is reported in this work. The proposed comparator-based current mode control method with on-time modulation eliminates the controller delay in constant on/off time period during load transient, which is adopted in a buck-boost DC-DC converter to achieve faster load transient responses...
An area-efficient feedforward multi-bit sigma-delta modulator is designed in this paper. By adopting fourth-order 17-level quantization structure, the modulator can achieve 20-bit resolution of 20kHz signal bandwidth with 64 oversample ratio. A novel full feedforward architecture is employed in this modulator, which minimize every stage load to save chip area and power consumption by select relatively...
Four-switch three-phase inverter-fed induction motor drive is very attractive because it can be utilized in fault-to-lerant control to solve the open/short-circuit fault of the six-switch three-phase inverter without redundant power switches. However, the balanced three-phase current collapses due to fluctuation of the dc-link capacitor. Allowing constraints included, the predictive torque control...
The latest virtual instrument and automatic test technology are adopted. One set of UAV avionics automatic test system for comprehensively testing radio altimeter, diastimeter anti-collision and alarm system, radio compass and multi-mode receiver is designed based on PXI module and GPIB instrument. Realization concept of key technologies, such as software and hardware design method, interface adaptation,...
There's more and more requirement for fast rise time pulse generator especially with high repetition frequency and high voltage. A cost effective and portable high-repetition high voltage nanosecond rectangular pulse generator is developed in this paper using serial avalanche transistors. By carefully designing the serial transistor circuit and PCB, the stray inductance and voltage reflection are...
Femtocells are envisioned as a key solution to embrace the ever-increasing high data rate and thus are extensively deployed. Given that numerous femtocell access points (FAPs) deployed in ultra- dense networks (UDNs) lead to significant energy consumption, boosting their energy efficiency (EE) becomes an important issue to be addressed. However, most existing works either focus on homogeneous networks...
This paper proposes a novel anomaly detection method of network worms. The algorithm detects unknown worms by multidimensional worm abnormal detection technology, extracts its feature string via analyzing worm data with leap-style and creates new rules to detect the corresponding worm in case that the unknown worm attacks again. The paper has realized the automatic detection of unknown worms. Experiment...
The stick-slip oscillations of a multibody oilwell drill-string are studied in this paper from the point of view of control of underactuated system. The model has one control input acting on the rotary table from the land surface and multi-degree-of-freedom downhole parts comprising a series of hollow drill pipes, a number of much stiffer drill collars, and a drill bit suffering highly nonlinear friction...
This paper presents a 10-bit subrange successive approximation register analog-to-digital converter (SAR ADC). A 3.5-bit time-domain coarse ADC converts the analog input to the time delay of two pulse signals and a time-to-digital converter (TDC) is used to quantize the delay. The coarse ADC controls the switching of the higher 3-bit capacitors in the digital-to-analog converter (DAC). A 7-bit SAR...
A new solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is traditionally implemented by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 20 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of an H-bridge and an additional phase leg connected...
A novel empirical path loss model for indoor stairwell environment is presented. The model is based on the multiple-input-multiple-output (MIMO) measurements at 2.6 GHz. The model is divided into two scenarios, i.e., line-of-sight (LOS) and non-LOS (NLOS). In the case of LOS, the path loss exponent n is dependent with the increasing of frequency slightly and is fitted by the frequency using power...
A low power successive approximation register ADC (SAR ADC) using a high performance integer-based split capacitor array combining with a mixed switching strategy is presented in this work. The split capacitor is chosen to be 2 times unit capacitance rather than the traditional non-integer value which is difficult to get. This array features high linearity, low area and power consumption. Besides,...
Data center networks (DCNs) are inherently failure-prone owing to the existence of many links, switches and servers. Many times the failures of the components may be correlated resulting a set of connected components failing together. This correlated failure behaviour could be captured through the use of fault regions [1]. This paper explores the effect of such failures in DCNs, using four topologies,...
In this paper we study opportunistic spectrum access (OSA) policies in a multiuser multichannel random access setting, where users perform channel probing and switching in order to obtain better channel condition or higher instantaneous transmission quality. However, unlikely many prior works in this area, including channel probing and switching policies for a single user to exploit spectral diversity,...
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