Phase detector circuit

专利名称：Phase detector circuit发明人：Bernardo Rub,Norman A. Field申请号：US06/375932申请日：19820507公开号：US04484142A公开日：19841120

摘要：The present invention includes a first input signal circuit to receive pulse signalsfrom a voltage-controlled oscillator (VCO), or some other controllable pulse signalsource, and a second input signal circuit to receive pulse signals from a magneticrecording medium, or some pulse signal source, with which the voltage controlledoscillator is to be put in phase synchronization. A correction signal generator circuit isconnected to both the input signal circuits to provide a first correction signal in responseto a pulse signal from the recording medium and to provide a second correction signal inresponse to a pulse signal from the VCO. There is a third circuit which monitors how longa correction signal is in effect and if such a correction signal is present for longer than apredetermined time, the third circuit terminates the correction signal to enable a newcorrection signal to be generated in response to the next one of said input signals toarrive. Finally, there is a fourth circuit which is connected to the correction circuitry topermit it, in a first mode of operation, to be enabled at all times to phase correct thecontrollable pulse signal source in response to a predetermined pattern of signals fromthe recording medium and to permit it, in a second mode of operation, to be availableonly during \"window\" periods initiated by pulse signals from the recording medium.

申请人：DIGITAL EQUIPMENT CORP.

代理人：Ronald Reiling,Albert Cefalo,Vincenzo Pitruzzella

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