A phase-locked loop included in a reproduce signal processing circuit which as a magnetic recording and reproducing device or the like. The phase-locked loop accurately detects a phase and can be operated at high speed. The phase-locked loop includes a data determining circuit for judging data at individual...http://www.google.com.tw/patents/US6034998?utm_source=gb-gplus-share專利 US6034998 - Method of and apparatus for detecting phase
