A low power multi-band selector DLL with wide-locking range

A delay-locked loop of multi-band selector with wide- locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The operation frequency can be ranged from 250MHz to 900MHz. The static phase error is 6.75ps and 23.65ps at 250MHz and 900MHz respectively. The power dissipation is 14.5mW at 900MHz. The circuit is designed by using TSMC 0.18- μ m single-poly six-metal CMOS process.