In this paper, digital phase locked loop (DPLL) using a capacitor multiplier is proposed. DPLL is composed of phase frequency detector (PFD), charge pump (CP), voltage controlled oscillator (VCO), loop filter (LF), and divider. Loop filter is a second order filter with a large capacitor. It is difficult to integrate a large capacitor into the chip, so a capacitor multiplier is used to implement a large capacitor of loop filter. The proposed DPLL was designed and fabricated with a 0.13μm CMOS process.