Design and implementation of an ultra-wideband Chirp signal source based on DDS and PLL

Chirp ultra-wideband has the advantages such as peak to average power ratio close to 1,strong ranging positioning capability,and it can effectively solve the problems of traditional UWB technology such as large PAPR,short transmission distance.One of the key technology in this communication system is to design Chirp UWB signal.This paper proposed a high performance Chirp UWB signal generator method,by using the FPGA(field-programmable gate array) to control of DDS(direct digital synthesizer) chip AD9956 produced low-frequency Chirp signal,and then combined it with phase-locked loop(PLL) technology to implement the bandwidth expansion,thus gained Chirp UWB signal.Experiments show that the design of Chirp UWB signal source has the advantages such as simple structure,scalablity,programmability high performance,and practicality.