Wide-range synchronous mirror delay with arbitrary input duty cycle

A wide-range synchronous mirror delay (SMD) with arbitrary input duty cycle is presented. The proposed SMD utilises the time-to-digital converter for a frequency-range selector and a multiband delay monitor circuit to achieve a wide range of operating frequencies. The simulation results show that the operating frequency is from 200 MHz to 1 GHz and the static phase error is 6.7 ps. The locking time is less than eight clock cycles: two cycles with coarse tune and six cycles with fine tune.