A wide-range all-digital delay-locked loop in 65nm CMOS technology

An ultra wide-range delay-locked loop (DLL) has been fabricated in 65nm CMOS technology. The proposed leakage delay unit (LDU) can easily generate a large propagation delay to reduce the difficulties to build up the high-speed digital counter in the cycle-controlled delay unit (CCDU) for a very low-frequency operation. The proposed DLL circuit can operate from 500 KHz to 1 GHz, and the power consumption is 1.8mW @1GHz with very small active area (0.01mm
²
).