Advanced Materials Research Vols. 753-755

Abstract: Because of the communication distance, the more nodes, the requirements of high real-time, LED lighting control system for railway vehicle carriage chooses Controller Area Network (CAN) as the communication mode to achieve centralized control in all carriages. Illuminance gathered from multi-sensors which were installed on the surface of the carriages was feed back to the Industrial Personal Computer (IPC). And then, through the incremental PID control algorithm, the IPC achieve the brightness of the lighting system intelligent control for vehicle consulting brightness intensity which according to the external environment. Experiment shows that this method is practical and effective.

Abstract: In this paper, at first, a conceptual circuit is introduced to illuminate how to use negative feedback to set up operating points. After that, a bias circuit is design using negative feedback theory. The stimulated results show that the designed bias circuit are very stable, having a phase margin of 93.04 degrees , and that the output impedance of the bias circuits has a low pass nature with a DC value of about 5 ohms.

Abstract: For modern high speed DAC, receiving data reliably from FPGA is a big challenge, data-independent skew is the major problem. usually system employ data clock while transmitting LVDS data from FPGA. then LVDS data is latched by delayed data clock which generated by DLL in chip. Because DLL has a negative feedback loop, system suffer small effect of PVT variations, robustness is guaranteed. The receiving circuits were implemented in a all-digital 0.18μm CMOS technology ,occupies 0.7 mm² of area. It operates in the frequency range of 20 MHz~600 MHz.

Abstract: In this paper, a novel track and hold circuit in 0.35um SiGe BiCMOS process is presented. Compared to the traditional one, several improvements are made on the proposed track and hold circuit. At first, multistage architecture is used, which has better isolation. Secondly, a saturation protection circuit is designed into the track and hold circuit to prevent the NPN transistor from getting into saturation state. The simulation results show that the proposed track and hold circuit has a SFDR of 82dB and SNR of 76dB at the sampling rate of 1.25Gsps. Further simulation proved that the proposed track and hold circuit has better performances than the traditional one.

Abstract: In this paper, a kind of novel DAC architecture is proposed. Compared to the traditional DAC architecture, the proposed is a multistage one. In order to improve precision, we use a kind of feedback bias circuit, which can minimize the effect of the base currents. A 16-bit DAC transistor-level circuit is implemented in 0.18um SiGe process. The simulation results show that the DAC using the proposed architecture has higher resolution, and better static and dynamic performances than the traditional one.

Abstract: Being aim at designing a system controller used in the Noninvasive Bidirectional Positive Airway Pressure Ventilation (N-Bi-PAPV) and advancing this medical device to serve the respiratory patients who suffer from the OSAHS, COPD and etc, by using an embed ARM Microcomputer LM3S9B92, the system controller including its circuit diagram and embed software was designed in accordance with the request of Bi-PAP medical ventilator. And the ventilators critical parameters were clearly defined and ranged for this system. After testing in a spontaneously breathing simulator, this system controller may be used to control the ventilator performing function well.

Abstract: In this paper we designed a portable ECG monitoring system based on Cortex-M3. The system was composed of the microcontroller LPC1788 and the analog front-end ADS1298 which provided a low-noise, 8-channel, 24-bit delta-sigma analog-to-digital converter. The monitor used SD card for data storage and USB for data transmission, which was capable of monitoring both dynamic ECG and conventional ECG. The system could work up to 24 hours with a resolution of 24 bits and 1024Hz sampling rate. The designed system embodies several characteristics including portability, low power, large capacity, and high resolution, which are quite suitable for ECG monitoring.

Abstract: Exploring a kind of the humidity data acquisition system with higher performance-price ratio is vital to the environmental monitoring. At the present work, a novel of the humidity data acquisition system has been developed so as to collect and store the environmental humidity data. It consists of humidity sensor of DHT11£¬LED digital display and single chip microcomputer (SCM) of AT89S52. AT89S52 was used as the control chip which assembled with humidity sensor of DHT11 and digital display. Moreover, the behavior of humidity data acquisition was simulated with the software of Proteus; the results show that this designed system can collect the humidity data at bigger range. Therefore, the designed humidity acquisition system effectively achieves humidity monitoring, and has advantages of smaller volume, higher performance-price ratio, and portable.

Abstract: An exhaustive design to the micro-architecture of SIMD core based on PIM technology is made; meanwhile the system architecture is implemented completely by applying Verilog hardware description language, and is simulated by the simulation software Xilinx ISE, the verification of the functional correctness is obtained as well via the simulation waveform. As the result, it can be concluded that the bandwidth and the delay of data accessing can be increased and reduced respectively by making full use of PIM technology, and then the performance of the entire system can be greatly improved accordingly.

Abstract: The graph and model integrative technology is used in the power network management. In this paper, we presented a mechanism of designing the power network management architecture with the graph theory involved. In our scheme, we describe the device topology by characteristics of node connection and port features. Then the automatic construction of the topology is focused and the system integrality is also examined. Besides, several functions are developed such as the graph editor, model storage, visualization and data analysis in power network management. The graph-based technology is applied to analyze the communication network topology. And experiment results show that it can exactly improve level of power equipment visualization.