Skip to Main Content
We propose a wide range PLL (phase locked loop) for 64X speed CD-ROM and 10X speed DVD-ROM. The proposed PLL has a locking range of 75 MHz-370 MHz. A new V-I converter and a differential delay cell are used in a 3-stage ring VCO to reduce jitter. In addition, we propose a new charge pump which has perfect current matching characteristics for sourcing/sinking currents. This new charge pump improves the locking time and the locking range of the PLL. Implemented in a 0.25 /spl mu/m, 1-poly 5-metal CMOS process, the wide range PLL consumes less than 100 mW with a single 2.5 V power supply. It occupies an active area of 1.9 mm by 1.1 mm.