An apparatus comprising a control circuit and a first circuit. The first circuit may be configured to generate a calibration signal in response to an adjustment signal and a first control signal. The control circuit may be configured to generate (i) the first control signal, (ii) a second control signal...http://www.google.com.tw/patents/US6946920?utm_source=gb-gplus-share專利 US6946920 - Circuit for locking an oscillator to a data stream
