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文章针对掌上软件无线电平台中的下变频技术进行了论述,比较了直接下变频与超外差结构的优缺点。详细介绍了以AD8347为核心的直接下变频模块,给出了其实例应用。
This article discusses the downconversion technology in the handheld software radio platform, and compares the advantages and disadvantages of the direct downconversion and superheterodyne structures. Described in detail to the AD8347 as the core of the direct conversion module, gives examples of its application.