定义 中文名称： 频率下转换 英文名称： frequency down-conversion 定义： 两束不同频率的光束在非线性介质中混频而产生差频的过程。 应用学科： 机械工程（一级学科）； 光学仪器（二级学科）；激光器件和激光设备-激光技术（
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A quadrature down-conversion mixer based on this topology is designed and optimized for an ultra high frequency RFID reader.
设计并优化了一个基于共用跨导级结构的用于超高频rfid阅读器的正交下变频混频器。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam.
在接收模式下，则利用DDS技术产生接收信号下变频所必需的本振信号，然后采用DBF技术形成接收波束。
By peak value sampling the information of baseband signal can be obtained from an am signal directly. By frequency conversion sampling the carrier wave's frequency of a PSK signal can be cut down.
对AM信号进行峰值采样可以直接获得基带信号的信息，对PS K信号进行变频采样可以降低其载波频率。
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