Fmwc signal generator and radar apparatus using fmcw signal generator

A frequency modulated continuous wave (FMCW) signal generator using a PLL comprising:

• a frequency divider to divide an FMCW signal at a preset dividing ratio to obtain a frequency divided signal;
• a reference signal generator to periodically generate a reference signal at a second time interval not less than a loop time constant set for the PLL, a frequency of the reference signal being discretely swept within a range of fc±Δf (fc is a center frequency, and Δf is a frequency sweep width) at a first time interval not more than the loop time constant;
• a comparison unit configured to compare the frequency divided signal with the reference signal to generate a comparison result signal corresponding to a phase difference between the frequency divided signal and the reference signal;
• a loop filter to filter the comparison result signal to generate a control voltage signal;
• and
• a voltage control oscillator to have an oscillation frequency thereof controlled by the control voltage signal, to generate the FMCW signal,
• wherein the loop time constant for the PLL is set between the first and second time intervals.