Filtering by Aliasing: Sharp Programmable Integrated Filters using Simple Time-Varying Components

这是一个很好的建议，将对无线通信接收器做出重大贡献，并将允许增强对无线电频谱的访问。这变得非常关键，因为频谱访问正在成为一个主要的社会问题。这项研究如果成功，将缓解这些问题中的一些，并将带来重大的社会效益。它还包含了一个全面的扩展活动和研究与教育的一体化。更广泛的影响该项目的更广泛的影响至少有两个方面。首先，这项研究活动在可重构集成滤波器的设计方面取得了突破，这对软件定义和认知无线电的研究以及通信系统的发展和电子行业的发展至关重要。特别是，使认知无线电可以潜在地支持在不久的将来更多的私人和公共连接的需求不断增长。第二，研究活动的结果和发现将是有益的，在开发学术材料和培训未来的电路和系统设计人员的多学科思维的重要性，为解决当前和未来的通信系统problems.INTELLECTUAL MERITThe拟议的研究目标是开发尖锐的，可编程的集成滤波器，将使广泛的应用，包括软件定义和认知无线电。这样的滤波器将减小接收到的通信信号的带宽和动态范围，使它们易于数字化和随后的接收机处理。所提出的方法是采用简单的，但周期性地随时间变化的电路元件，以显着提高有效的滤波采样前的数字化实例。这项研究的智力价值在于，使用周期性时变元件是一种更有效和根本不同的电路设计方法。如今，大多数滤波器都是时不变的，特别是在无线接收器中，它们需要高质量的声学滤波器组件，这些组件体积庞大、价格昂贵、难以集成，最重要的是不可编程。拟议的办法将消除对这种不灵活的组成部分的需要。所提出的研究的具体目标是验证使用原型集成电路和必要的理论方法来分析时变电路的发展。预计后者还将使滤波器设计应用之外的周期性时变电路得到更广泛的接受。

THIS IS AN EXCELLENT PROPOSAL WHICH WILL MAKE SIGNIFICANT CONTRIBUTIONS TO WIRELESS COMMUNICATION RECEIVERS AND WILL ALLOW ENHANCED ACCESS TO THE RADIO SPECTRUM. THIS IS BECOMING VERY CRITICAL SINCE SPECTRUM ACCESS IS BECOMING A MAJOR SOCIETAL ISSUE. THIS RESEARCH, IF SUCCESSFUL, WILL ALLEVIATE SOME OF THESE PROBLEMS AND WILL RESULT IN MAJOR SOCIETAL BENEFITS. IT ALSO CONTAINS A COMPREHENSIVE PLAN FOR OUTREACH ACTIVITIES AND INTEGRATION OF RESEARCH AND EDUCATION.BROADER IMPACTSThe broader impacts of the project are at least two fold. First, the research activity brings a breakthrough in the design of reconfigurable integrated filters that is crucial to the re-search on software-defined and cognitive radios and the growth of communication systems in particular and the electronics industry in general. In particular, enabling cognitive radios can po-tentially support the increasing demand for more private and public connectivity in the near fu-ture. Second, the results and discoveries of the research activities will be useful in developing academic material and training future circuits and systems designers in the importance of multi-disciplinary thinking for solving current and future communication systems problems.INTELLECTUAL MERITThe objective of the proposed research is to develop sharp, programmable integrated fil-ters that will enable a wide range of applications including software defined and cognitive radios. Such filters will reduce the bandwidth and the dynamic range of the received communication signals rendering them amenable to digitization and subsequent receiver processing. The proposed approach is to employ simple but periodically time-varying circuit components to significantly enhance effective filtering at sampling instances prior to digitization. The intellectual merit of the research is that the use of periodically time-varying components is a much more efficient and fundamentally different approach to circuit design. Today, most filters are of the time-invariant variety and particularly in the wireless receiver, they need high quality acoustic filter components that are bulky, expensive, difficult to integrate and most importantly, not programmable. The proposed approach will obviate the need for such inflexible components. Specific goals of the proposed research are validation using a prototype integrated circuit and the development of necessary theoretical methods to analyze time-varying circuits. It is expected that the latter will also enable wider acceptance of periodically time varying circuits beyond filter design applications.