Abstract:

A scheme for producing a linear frequency modulation signal generated by rapidly changing the division ratio of the phase locked loop is studied in this wok.The impact of the phase detect frequency of the phase detector on the linearity of the sweeping signal is discussed.By analyzing the results of ADS modeling simulation,it is concluded that a FMCW signal with high precision and good linearity can be observed with an appropriate interval of the change of division radio and a higher frequency of the phase detector leads to better linearity of the FMCW signal.

Key words: frequency modulated continuous wave;phase detector;phased locked loop;linearity