Positive and negative alternating frequency sweep oscillator and phase-locked loop system with same

The utility model discloses a positive and negative alternating frequency sweep oscillator and a phase-locked loop system with the same. The positive and negative alternating frequency sweep oscillator comprises a positive KVCO frequency modulation module, a negative KVCO frequency modulation module, an integrated inductor module, a switching capacitor module, a numerical control capacitor array module, a cross coupling tube module and a control module, and the positive KVCO frequency modulation module is a positive slope frequency control module, so that the output frequency of the oscillator is increased along with the increase of the control voltage. According to the utility model, a mode of switching positive and negative alternating frequency sweeping through the digital signal Control is adopted, a wider frequency sweeping range is realized with a lower KVCO value, the problem of wide frequency sweeping range is solved in an advanced CMOS (Complementary Metal Oxide Semiconductor) process with low power