Design of Broadband Phase Locked Sweep Frequency Source

According to design goals of sweep frequency source,a new scheme is presented by making the best of advantages of DDSdriven PLL and DDSgenerated frequency offset,which are firstly analyzed and compared.And its feasibility is shown.It indicates that this scheme can get low phase noise for wideband frequency source by effectively reduced multiple N.At the same time,the merits of DDS such as super fine frequency resolution,high frequency accuracy,easy programmed and in combination with the excellent character of narrowband tracing filter merits of PLL make the little step and process control sweep function easily achieved.At last,the experimental result proved the rationality of this method.