Cmos Charge Pump Phase-locked Loop Design Technology Research

Phase-locked loop is a principle of the use of feedback control to achieve the frequency and phase synchronous technology. PLL is widely used in wireless communications, digital television, radio, and other products. Using PLL synthesis technology such as frequency multiplication and frequency division, may obtain the multi-frequencies, the high stable oscillator signal output.According to the CMOS charge pump PLL's working principle and application, using PLL's two aspects of the mathematical model in the time domain and frequency domain, using SMIC 0.18um CMOS technology, PLL used in digital television has been simulated, analyzed, layout and tape out. After testing, PLL's jitter is smaller, meets the company product requirement.