System and method for synchronising data

专利名称：System and method for synchronising data发明人：Yamanoi, Koyu,Yamauchi, Toshio,Kobayashi,

Hiroshi

申请号：EP97305794.6申请日：19970801公开号：EP08226A3公开日：19990818

专利附图：

摘要：The present invention discloses a fully integrated data synchronization circuitfor a disk drive read channel system. The data synchronization system comprises dualdata synchronizers to provide read reference clocks. Dual PLL circuits are coupled to the

data synchronizers to provide a stable reference frequency to data synchronizers. One ofthe two data synchronizers is used to obtain leading edge data, while the other is fortrailing edge data. Each PLL circuit comprises a phase detector, a charge pump, and aVCO. A loop filter is used in conjunction with a charge pump to control loopcharacteristics of the PLLs. In an idle mode, one of the PLLs is used as a time basegenerator to provide a stable reference frequency to data synchronizers. Once datasynchronizers achieve lock using the stable reference frequency and switch over to readdata, the time base generator PLL is switched over to function as a data synchronizer PLLin a read mode. Thus, one of the PLLs is used as both time base generator and datasynchronizer PLL, thereby eliminating the need for extra PLL circuitry and requiring onlytwo PLL circuits to support time base generation and data synchronization.

申请人：TEXAS INSTRUMENTS INCORPORATED

地址：13510 North Central Expressway Dallas, Texas 75243 US

国籍：US

代理机构：Holt, Michael

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