有线电视系统前端功能和前端设计

为提升有线电视系统功能,更好地实现信号传输,介绍了有线电视传输前端功能,分析了前端设计的具体内容,即:合理分配系统指标,选择最佳信号源,做好节目规划与频道配置,确定前端组成方式、输入电平、输出电平。

Design and Analysis of Analog Front-End of Passive RFID Transponders

An analog front-end of HF passive RFID transponders compatible with ISO/IEC 18000-3 is presented.Design considerations, especially the power transmission in the RFID transponder, are analyzed. Based on these considerations,an analog front-end is presented with novel architecture, high power conversion efficiency, low voltage, low power consumption, and high performance in an environment of noise and power fluctuation. The circuit is implemented in a Chartered 0.35μm standard CMOS process. The experimental results show that the chip can satisfy the design target well.

后端效率是实现网络一统的关键

网络设备的功能可分为前端和后端，前端功能完成的是对负载的接收和发送，后端则处理更具智能的决策，诸如：为休要发这个数据包，怎样发这个数据包，要做什么处理等。路由器等设备在互联网发展的早期，完成的功能多是在前端，即只是简单地收、发数据包。