Advanced Materials Research Vol. 981

Abstract: As a physical therapy way,music therapy has been widely used. The choice of music is very important during treatment because different music has different curative effect. However, the choice of music often come to depend on people's subjective feeling and the theoretical foundation why the music is chosen is unknown. In this paper, the choice of music,i.e. music prescription,is considered from the following three aspects.Firstly,the power spectral density of the music must satisfy the 1/f fluctuation law.Secondly, the relationship must be ascertained between the frequency of the music and symptoms.Thirdly, melody and rhythm of the music should be choosen for different symptoms. Clinical test show that the scheme in this paper is feasible and the treatment effect is significant.

Abstract: Small signal gain of fiber amplifier has been measurement using a small signal broadband light source of simple and more accurate. And through the numerical simulation for test condition and experimental results of this method are discussed. The factors influencing of the erbium-doped fiber amplifier gain has been simulation and analysis, and effect of fiber length on the gain of the test. A new method is proposed for measuring optical fiber amplifier gain spectrum.

Abstract: This paper targets the computer architecture courses and presents an Field Programmable Gate Array implementation of a RISC Processor via Verilog HDL design. It has 8-bit instruction words and 4 general purpose registers. It have two instruction formats. And it has been designed with Verilog HDL, synthesized using Quatus II 12.0, simulated using ModelSim simulator, and then implemented on Altera Cyclone IV FPGA that has 484 available Input/Output pins and 50MHz clock oscillator. The final overall simulation's experimental data verify the correctness of the processor.

Abstract: In order to detect OTFT small signal dynamic characteristics of weak current, we designed the detection circuit. The current detection range of the circuit is 10^-9～10^-6A, circuit bandwidth reaches 10kHz.According to the data tested by copper pthalocyanine thin organic static induction transistor we prepared, an equivalent circuit for simulating its dynamic performances was built and the factors influencing the performance of the device was investigated. The simulation results and actual test results are basically identical,which show the reliability of organic thin film transistor equivalent circuit model. In addition, through analyzing the model structure and the simulation results, the grid schottky junction capacitance and the device current intensity are the important factors in determining the dynamic properties of organic thin film transistor.

Abstract: This paper presents a design and analysis method of a bandgap reference circuit. The Bandgap design is realized through the 0.18um CMOS process. Simulation results show that the bandgap circuit outputs 1.239V in the typical operation condition. The variance rate of output voltage is 0.016mV/°C with the operating temperature varying from-60°C to 160°C. And it is 3.27mV/V with the power supply changes from 1.8V to 3.3V.

Abstract: A design project of voltage controlled oscillator which is the central component of the low voltage phase locked loop (PLL) is proposed in this paper. The VCO adopted the folding differential voltage controlled oscillator.Simulation results in Cadence Hspice indicate that the VCO proposed behaves in good linearity, simple structure, small phase noise.The frequency range from 125 to 787 MHz, the power consumption of this oscillator is only 6mW at central frequency is 480MHz with 3V power supply.

Abstract: The paper attempts to realize the processing scheme of low cost dual sine wave generator. It used single-chip microcomputer and CPLD(Complex Programable Logic Device) as the control core. It maked use of CPLD and discrete component simulations to implement DDS principle. It utilized the filter circuit, integrated op-amp circuit and multiplier circuit instead of DAC chip. The range of frequency, amplitude and phase difference are 1Hz~1000Hz, 1V~3V and 0o~359o, respectively. The results show that a 2-channel sine signal generator can be designed with adjustable frequency, amplitude and phase difference.

Abstract: A design project of 16 bit RISC MCU with full scan structure by the tool of SYNOPSYSTM DFT COMPILER. The flip-flops can be linked into the chains; the memory modules in the MCU were tested by the technology of BIST; and the circuits were tested by the test vectors by ATPG. The chip test circuit include 8 chains, and cover rate can reach at 99.20%.

Abstract: CORDIC Algorithm is widely applicable to the hardware implementation of DSP, and it attaches a great importance in many hardware implementations of DSP for a lot of arithmetic operations are simplified to simple addition operations and shifting operations. The FPGA implement of sine and cosine functions are achieved through CORDIC Algorithm in the paper, and the input and output data of the entire structure complies with IEEE754 standards. The basic theory of CORDIC Algorithm is introduced first in the paper, then the hardware iterative formula and the flow chart get out of basic formulas are given, and the structure of the design is introduced in detail, at last synthesis and simulation results are given.

Abstract: With the increasingly widespread application, the requirement for PHM of IGBT is becoming gradually urgent. Based on particle filter theory, a method for remaining useful life (RUL) prediction of IGBT is proposed. Firstly, the deterioration parameters on-state VCE and ICE are extracted by temperature cycling test, then a model is developed based on the degradation trend exhibited by deterioration parameters. In the end, PF approach is applied to the IGBT's RUL prediction with the mentioned model. The results show that the proposed prediction method can achieve high prediction accuracy.