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。
2
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by downfrequencyconversion 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。
3
By peak value sampling the information of baseband signal can be obtained from an am signal directly. By frequencyconversion sampling the carrier wave's frequency of a PSK signal can be cut down.