Applied Mechanics and Materials Vols. 380-384

Abstract: In this paper, an operational amplifier with low-power consumption has been designed. Using the complementary differential pair for the input stage and the class AB structure for the output stage, the common-mode input range and output swing of the proposed circuit could achieved rail-to-rail. Based on TSMC 0.18μm CMOS process, using HSPICE 2008 software for circuit simulation, the results showed that the proposed op-amp has more than 100dB open loop gain, meanwhile the static power consumption is less than 300μw. The circuit's phase margin is 68 degrees, CMRR is 135dB and power supply rejection ratio is 63dB.

Abstract: This paper presents the design of low noise CMOS pre-amplifiers based on photoelectric detection systems, which can directly affect the detecting precision of the whole systems. The design of pre-amplifier circuit from photoelectric detector was introduced. The photoelectric conversion circuit, amplifier circuit bandwidth, amplifier circuit noise, amplifier circuit stabilization and other questions were mainly discussed, and an amplifier circuit capable of effectively decreasing the noise, the temperature drift and a large dynamic range was designed. This paper analyzes the sources of photoelectric detection circuit internal noise, and gives the formulas of internal noise, designs a variable equivalent load photoelectric conversion circuit, and is verified by experiments. Then the result is used to reduce the noise of CMOS based operational amplifiers and finally implement the design work of pre-amp using 0.5μm CMOS Technology.

Abstract: Direct digital frequency synthesizer (referred to as DDS) is a kind of complete digital frequency synthesizer. In this article the principle of DDS were introduced. Set the design index of distortion and resolution, and design parameters of DDS in accordance with the index. DDS design describes by Verilog HDL, implement controlling four parameters of the waveform, frequency, phase, amplitude. Using FPGA and Quartus II/Nios IIwhich is Altera EDA software, realize DDS and its peripheral input / output and DA platform. The final direct to DDS simulation results and the overall DDS platform oscilloscope experimental data, verify the correctness of the design of DDS with the two data.

Abstract: Addition is the most frequent floating point operation in modern microprocessors. The design of floating point addition is relatively complex than other flotation point arithmetic operations. Due to its complex shift-add-shift-round data flow, floating point addition can have a long latency. This paper has shown an efficient implementation of addition module on a reconfigurable platform cyclone IV EP4CE15, which is both area as well as performance optimal. The proposed design has optimized the individual complex components of adder module (like dynamic shifter, leading one detector (LOD), priority encoder), to achieve the better overall implementation. Comparison with the best reported.

Abstract: A low-pass filter for the sensor is presented, which based on the linearized transconductance structure and the capacitance scaler schemes. The filter adopt fourth order cascade structure, and simulation by 0.5μm CMOS process. Simulation results for the filter show a cutoff frequency of 150Hz, while band ripple is less than 0.8 dB. The power consumption for the filter is only 1.6mW, meet the requirements of the sensor interface ASIC for low-pass filter.

Abstract: Nowadays, the use of new energy increasing attention has been paid. In response to the current situation of shortage of energy, people will treat photovoltaic inverter as a new power supply. In order to improve the utilization of solar energy, the single-phase photovoltaic inverter power grid and the public grid operation. It is important that the effective control in the process of grid Inverter for solar. Lack of the PID strategy in the grid control, model reference adaptive control is improved. The method is verified by simulation applied to the reasonableness of the grid control.

Abstract: This paper introduces a new kind of decoder structure for FPGA implementation of high-speed memory efficient quasi-cyclic LDPC (QC-LDPC) decoder. The code structure, algorithm and hardware structure all adopt optimization design. The decoder adopts modified Turbo decoding algorithm and achieves a decoding throughput of 223 Mbps and frame size of 3,200 bits. The Xilinx Virtex-4 chip used by the decoder only takes up 71 KB memory and makes it exceeds other decoders in aspects of throughput and memory for FPGA implementation.

Abstract: The purpose of electrical load management in a manufacturing plant is to change the load profile in order to gain from reduced total system peak load and increased power factor. One of the widely taken approaches is to optimize the schedule of electrical equipment operation hours to take advantage of incentives and favorable pricing offered by utilities. In this paper, we present our work in designing and developing a web based tool for manufacturing plants to find out an optimal operation schedule of equipment so as to reduce energy cost. The tool allows users to configure their load by specifying electrical devices and their various parameters. Then the online system will assess power consumption over a certain time period, as well as peak power demand and power factor of the defined load.

Abstract: In this paper, we study the problem of end-to-end network traffic estimation in the electric power communication network. Based on principal component analysis and multifractal wavelet model, we propose an effective and precise approach to estimate each origin-destination pair. Numeral results state that our method can capture the changes of end-to-end network traffic accurately in electric power communication network.

Abstract: This paper presents a new method of a FBG sensor for temperature measurement in the well logging system. FBG Sensors have a wide range of precise temperature measurement highlighting characteristics, at the same time, they also can realize measurement and stress more distributed measurement, which provides the key technology for real-time wellsite data acquisition, analysis, and the decision-making, as well as improves the existing oil field recovery.