Digital Upward Frequency Conversion Technology

The technology of direct digital frequency synthesis has been most developed in the recent years.At the same time,the digital intermediate frequency signal processors are also presented.In this paper,a solution based on digital upward frequency conversion is proposed,which implements the conversion of a complex digital baseband signal to a real passband signal.In this design,we select AD6623 from ADI company as the digital up converter,and the principle,main departments,as well as the method for setting main parameters are also introduced.As a result,the multicarrier and multistandard digital signals are achieved.