Digital phase locked loop and operating method of digital phase locked loop

Abstract

The invention provides a digital phase locked loop and an operating method of the digital phase locked loop. The digital phase locked loop includes a digital phase detector, a digital loop filter, a digital controlled oscillator, a first divider that divides the second frequency of the oscillation signal depending on a first division value and outputs the division result as a division signal having a third frequency, a second divider that divides the second frequency of the oscillation signal depending on a second division value and outputs the division result as an output signal having a final frequency, a dithering block that receives the division signal and performs dithering on the first division value based on a preset pattern as cycles of the division signal pass, and a digital phasedomain filter that performs second low pass filtering on the division signal in a phase domain and outputs the result of the second low pass filtering as the feedback signal.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Korean Patent Application No. 10-2017-0078746 filed with the Korean Intellectual Property Office on June 21, 2017, the entire contents of which are incorporated herein by reference. technical field [0003] Example embodiments of the inventive concepts disclosed herein relate to a digital circuit. For example, at least some example embodiments relate to digital phase locked loops and / or methods of operating digital phase locked loops. Background technique [0004] A phase locked loop generates an output clock that is locked to an input clock. Phase-locked loops are used to transmit clocks in semiconductor integrated circuits. With the development of semiconductor manufacturing process, the power supply voltage of semiconductor integrated circuits may decrease. Moreover, with the development of the semiconductor manufacturing process, the allowable range of the leakage current may ...

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