| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a digital phase frequency detector, a digital phase locked loop including the same, and a digital phase frequency detection method. <P>SOLUTION: A digital phase frequency detector includes a detection unit, a phase comparison unit, and a reset unit. The detection unit detects edges of a reference signal and a feedback input signal to generate a reference edge signal and a feedback edge signal. The reset unit generates a reset signal based upon the reference edge signal and the feedback edge signal. The phase comparison unit generates first and second phase comparison signals based upon the reference edge signal and the feedback edge signal, and includes a first flip-flop, a second flip-flop, and a latch block. The first flip-flop has a data input end for receiving the reference edge signal and a clock input end for receiving the feedback edge signal. The second flip-flop has a data input end for receiving the feedback edge signal and a clock input end for receiving the reference edge signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
