This　paper　presents　a　new　technique　for　minimizing　spurs　in　charge-pump　phase-locked　loop　(PLL)　using　pulse　injection　(PI)　technique.　The　proposed　background　calibration　uses　pulse　injection　in　parallel　with　the　normal　operation　of　the　PLL　during　its　unlocked　phase　to　extract　the　charge　pump　current　mismatch　error.　The　mismatch　extraction　is　implemented　using　an　error　integrator　and　a　successive　approximation　register　(SAR)　controller　configured　in　a　negative　feedback　to　perform　background　calibration　during　the　normal　operation　of　the　PLL.　A　windowing　clock　is　used　to　extract　only　the　error　caused　by　the　injected　pulses　and　maintain　the　control　voltage　dc　level　outside　of　the　window.　Upon　completion　of　calibration,　the　injection　pulses　are　stopped　and　the　PLL　continues　its　operation　in　the　lock　state　with　minimized　spur.　The　proposed　technique　successfully　achieves　fast　calibration　without　interrupting　the　normal　operation　of　the　PLL.　The　simulation　results　show　good　improvements　of　spur　reduction　stemmed　from　the　charge-pump.　©　2020　IEEE.