Research in High-Frequency Analog Electronic Circuits for Communication Systems

电子通信领域在过去十年中经历了爆炸性的增长，无论是在其商业重要性方面，还是在学术和工业实验室对其进行的研究努力方面。看来，基于无线电的数字通信将发挥比预期大得多的作用，以光纤媒体补充电线对上的数据通信，光纤媒体将越来越多地用于数据通信骨干。与过去一样，利用VLSI技术来降低与此类系统相关的电子成本将是至关重要的。本研究旨在探索使用硅集成电路技术的新方法，以提高各种通信系统的性能，降低功耗，降低组件成本，主要侧重于使用无线电和自由空间光媒体的数据通信和个人通信系统（PCS）。特别强调的是电路技术，适用于实现射频，中频和基带混合信号通信电路与低功率和低工作电压。本研究的主要目标是发现、优化和展示新的电路方法，这些方法允许实现这样的系统，其功耗和性能水平比目前的方法更接近所使用的基本技术所施加的基本限制。一般感兴趣的领域是射频局域网和个人通信设备的射频收发器，光纤系统和基于线的系统的收发器。具体的研究主题是功率优化的单片压控振荡器的限相噪声性能、新型并行结构采样解调器的研究、MOS采样解调器的限相失真性能、无源采样FIR开关电容滤波器在低功耗、高频滤波环和CDMA扩频中的应用、光纤通信接收机灵敏度的优化、BiCMOS技术在高速通信中的特殊应用，以及射频设计中有源和无源IC元件的建模。

The field of electronic telecommunications has experienced explosive growth in the past ten years, both in terms of its commercial importance and in terms of the research effort devoted to it in academic and industrial laboratories. It appears likely that radio-based digital communications will play a much larger role than might have been anticipated, complementing data communications on wire pairs with fiber media coming into increased use for data communications backbones. As in the past, the utilization of VLSI technology to reduce the cost of electronics associated with such systems will be critical. This research is directed at exploring new ways to use silicon integrated circuit technology to improve the performance, reduce the power dissipation, and reduce the cost of components for communication systems of various kinds, with primary emphasis on data communications and Personal Communications Systems (PCS) using radio and free-space optical media. Particular emphasis is placed on circuit techniques applicable to implementation of RF, IF and baseband mixed signal communications circuits with low power and low operating voltage. The primary goal of this research is to discover, optimize, and demonstrate new circuit approaches which allow the implementation of such systems with levels of power dissipation and performance which more closely approach the fundamental limits imposed by the basic technology being used than current approaches. The general area of interest if RF transceivers for RF LANs ald personal communications devices, and transceivers for fiber-optic systems and wire-based systems. Specific topics for investigation are limits-to-phase noise performance in power-optimized monolithic voltage-controlled oscillators, investigation of new parallel- architecture sampling demodulators, limits-to-distortion performance in MOS sampling demodulators, the use of passive- sampling FIR switched capacitor filters for low-power, high- frequency filte ring and CDMA despreading, optimization of the sensitivity in fiber optic communication receivers, the application of BiCMOS technology for the particular needs of high-speed communications, and modeling of active and passive IC components for RF design.