DS4830的多地址I^2C总线从机模块设计

为了使Maxim公司的光微控制器DS4830满足光收发模块SFF-8472协议(光收发器件动态诊断监控接口协议)中的多I2 C总线从机地址的要求,根据DS4830内部I2 C总线主从模块及集成开发环境IAR的特点,设计了DS4830作为I2 C总线从机的硬件及软件。实验证明,该设计满足SFF-8472协议中关于I2 C总线从机的要求。

Novel Design of HID Lamp Electronic Ballast for Automotive Systems

This paper presents a high intensity discharge（HID） lamp for automotive illumination. A novel type of ballast for HID is proposed without an acoustic resonance. The system consists of high frequency DC/DC converter,DC/AC inverter（SLA2403M）, high voltage igniter and a microcontroller unit（MCU）. The proposed ballast controls the complex start-up process and constant power process by programming on the rnicrocontroller. It is verified that experimental results agree well with the calculated ones. The ballast features such functions as failure protection, line under-voltage, line over-voltage, output short circuit and disconnection protections.

Analysis and control of a non-smooth population model with impulsive effects

In this paper, a non-smooth population model with impulsive effects is proposed by combining discontinuity and non-smoothness. According to the qualitative theory of differential equations, the global analysis of the model is discussed. Using the theory of impulsive differential equations, the existence conditions of order one periodic solution are obtained. And the impulsive controllers are designed to make the pest populations stay at the refuge level. Some simulations are carried out to prove the results.

A fluid-guided printing strategy for patterning high refractive index photonic microarrays

High refractive index(HRI,n>1.8)photonic structures offer strong light confinement and refractive efficiencies,cover the entire visible spectrum and can be tuned by designing geometric arrayed features.However,its practical applications are still hindered by the applicability and material limitation of lithography-based micro/nano fabrication approaches.Herein,we demonstrate a fluid-guided printing process for preparing HRI selenium microarrays.The microstructured flexible template is replicated from the diced silicon wafer without any lithography-based methods.When heated above the glass transition temperature,the flow characteristics of selenium endows the structure downsizing and orientation patterning between the target substrate and the template.Near 10 times narrowing selenium microarrays(1.9μm width)are patterned from the non-lithography template(18μm width).HRI selenium microarrays offer high refractive efficiencies and strong optical confinement abilities,which achieve angledependent structurally coloration and polarization.Meanwhile,the color difference can be recognized under the one degree distinction of the angle between incident and refracted light.This printing platform will facilitate HRI optical metasurfaces in a variety of applications,ranging from photonic sensor,polarization modulation to light manipulation.

A widely tunable microwave photonic notch filter with adjustable bandwidth based on multi-wavelength fiber laser

A widely tunable microwave photonic notch filter with adjustable bandwidth based on multi-wavelength fiber laser is proposed and demonstrated. The multi-wavelength fiber laser generates the multi-taps of the microwave photonic filter （MPF）. In order to obtain notch frequency response, a Fourier-domain optical processor （FD-OP） is introduced to con- trol the amplitude and phase of the optical carrier and phase modulation sidebands. By adjusting the polarization con- troller （PC）, different numbers of taps are got, such as 6, 8, 10 and 121 And the wavelength-spacing of the multi-wavelength laser is 0.4 nm. The bandwidth of the notch filter is changed by adjusting the number of taps and the corresponding bandwidths are 4.41 GHz, 3.30 GHz, 2.64 GHz and 2.19 GHz, respectively. With the additional phase shift introduced by FD-OP, the notch position is continuously ttmed in the whole free spectral range （FSR） of 27.94 GHz. The center frequency of the notch filter can be continuously tuned from 13.97 GHz to 41.91 GHz.