Design and Implementation of Modified Charge Pump for Phase Locked Loop

-A PLL is a closed loop system that locks the phase of an output signal to an input reference signal. The term “lock” refers to a constant or zero phase difference between two signals. The components of PLL are the Phase Frequency Detector (PFD), the charge pump (CP), the low pass filter (LPF), and the voltage controlled oscillator (VCO). In which the charge pump has been modified in order to overcome the leakage current. Hence power consumption is reduced through the modified structure. All the components of PLL are designed and integrated. All the components are designed in 0.35μm CMOS technology. Once the locked state of PLL is achieved the output of all the components of PLL are constant. Keywords--PLL components, modified charge pump, Leakage current, CMOS