Abstract: There is provided a digital lock detector and a frequency synthesizer using the same. The digital lock detector includes a comparator unit receiving a plurality of control bits, and generating a bit signal to notice a lock condition of the plurality of control bits; a delay cell block generating a plurality of delay signals based on the bit signal, and outputting a clock signal by combining the bit signal and the plurality of delay signals; and a detection unit detecting a shift time of the clock signal, and generating a lock indication signal according to the detection result.
Type:
Grant
Filed:
April 29, 2011
Date of Patent:
September 6, 2011
Assignee:
Electronics and Telecommunications Resarch Instittute
Inventors:
Ja Yol Lee, Seong Do Kim, Mun Yang Park, Cheon Soo Kim, Hyun Kyu Yu