A 7 ps jitter 0.053 mm² fast lock all-digital DLL with a wide range and high resolution DCC

This paper presents a fast lock all-digital delay-locked loop (ADDLL) with a wide range and high resolution all-digital duty cycle corrector (ADDCC), which achieves low jitter, fast lock time, and accurate 50% duty cycle correction with a clock-synchronized delay (CSD) and time-to-digital converter (TDC) schemes. The ADDLL uses a self-calibration scheme to reduce the phase error and jitter, and a range doubler to double its operating frequency range with a negligible increase in power and area. The ADDCC employs a weighted signal generator to improve a resolution problem at high operating frequencies and a cycle detector to insure a wide operation range. The proposed ADDLL with the ADDCC was fabricated using a 0.18 μ m CMOS technology that operates over a wide frequency range from 440 MHz to 1.5 GHz with 15 cycles of maximum lock time. The peak-to-peak jitter is 7∼ps at 1.5 GHz with a power consumption of 43 mW and the area is 0.053 mm2.