Abstract: This paper designed a RFID-based card reader system, which is based on Cortex-M3 LM3S9B90 chip controller, using MRC531 as the base station chip and Mifare1S50 as card read-write. The system realizes the identification and data reading and writing of Mifare1S50 card with a frequency of 13.56MHz, while it can also communicate with the host computer conveniently. The communications use open-source TCP / IP protocol stack LWIP.
Abstract: In order to solve the defects in performance for analog RF circuit in deep submicron process, this paper discusses a new type of LC oscillators(Digitally Controlled Oscillator), which uses digital RF method to achieve the technology requirements of wireless communication. This new type of oscillator uses MOS varactor arrays to moderating the output frequency, through the using of digitally Sigma-Delta technology, we can get more precise resolution , and through using three modes progressively working way can make this kind of structure easily implement in process.
Abstract: This paper analyzes the mechanism of process antenna effect in ultra deep submicron IC physical design and provides the antenna ratio calculation method. A new elimination method of process antenna effect combined with clock tree synthesis is proposed. The elimination method minimizes the impact to the clock latency and clock skew by setting up reasonable constraint for clock tree synthesize. Finally, the elimination method is used during place and route of the physical design of a reconfigurable video decoder chip, which is based on TSMC 65nm low power technology. The proposed method eliminates the process antenna effect of the design effectively, also minimizes the impact to clock tree and chip timing to the least.
Abstract: Three-level power amplifier with the characteristics of a small ripple, Aimed at existing situations of the three-level power amplifier without ASIC chips, a new three-level power amplifier circuit based on FPGA(Field Programmable Gate Array) is presented. Detailed analysis the principle of the three-level power amplifier, According to the principle, the FPGA internal composition and function of each module is designed, programmed using VHDL Language, functional simulated and validated by Modelsim which is specialized simulation software. The actual production of the three-level power amplifier is experimental testing for a step signal and sinusoidal signal. Test results show that the current response of AMB coil is fast and the current track is good. Finally, industrial successful applications in the Active magnetic bearing spindle.
Abstract: This paper presents the embedded design of sweep signal generator which is based on ARM9+Linux platform. It describes DAC712 device dentally and prepared a DAC driver and upper application. Finally, the test signals generated by the system obtained the test results and the results were analyzed.
Abstract: The design of low-pass and bandpass filters is often based on the leapfrog method which, in these cases, yields integrator-based structures. Using the leapfrog signal flow graph (SFG) for the simulation of high-pass filters leads to a differentiator-based structure which could be implemented by Gm-C or CCII conveniently. However, when we use Op amp RC integrators for good linearity, we have to use integrators, and not differentiators, for reasons related to the excessive noise behavior of the latter. This paper presents a new leapfrog SFG implementation by fully differential Op amp integrators, which combines good high-frequency properties with good noise properties. The direct SFG simulation method and single-ended output Op amp can also based on integrators, but all of them will lead to a relatively high circuit complexity and a high noise level. A design example is included, with comparisons of gain responses and noise densities.
Abstract: A method that is used to calculate the transmission frequency and modulation of the On Board Unit (OBU) based on the baseband signal getting from PD5000 is introduced. The article focuses on the principle and the realization methods of this algorithm, and the hardware structure will also be introduced briefly
Abstract: Micro-assembly technology is one of important processing technologies to realize electronic equipments miniature and light with high performance and reliability. The key techniques in micro-assembly of micro-radio modules were discussed in this paper with analysis of their characteristics. Some suggestions in application of micro-assembly were pointed out in the end of this text.
Abstract: To improve data transmission performance of the data acquisition card, a design of high-speed data transmission system is proposed in the thesis. Using FPGA of programmable logic devices, adopting Verilog HDL of hardware description language, the design of modularization and DMA transmission method is implemented in FPGA. Eventually the design implements the data transmission with high-speed through PCI Express interface. Through simulation and verification based on hardware system, this design is proved to be feasible and can satisfy the performance requirements of data transmission in the high-speed data acquisition card applied in high-speed railway communication. The design also has some value of application and reference for a universal data acquisition card.
Abstract: In microelectromechanical systems, F-P cavity is one of the most common structures, air cavity thickness of a F-P cavity is about a near wavelength, the thickness of the air cavity is less and the interference series is low, so the reflective phases of the reflectors have much influence on the peak wavelength. The linear relationship between the thickness of an air cavity in a tunable filter and the resonant wavelength is deduced and tested by numerical computation in the article. The research is of practical significance for the design of a F-P cavity tunable wavelength selector.