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System and method for correcting gain error of a phase detector due to transition density variation in clock recovery systems
System and method for correcting gain error of a phase detector due to transition density variation in clock recovery systems
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机译:用于校正由于时钟恢复系统中的过渡密度变化而导致的相位检测器的增益误差的系统和方法
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摘要
The present invention is directed to a system for processing a data stream. The system comprises: a voltage controlled oscillator (VCO) (105) that generates a VCO signal in response to a tuning signal; a phase detector (211) that generates an error signal that is indicative of a phase difference between a data signal and the VCO signal; a first filter (202) that filters a reference signal that is indicative of an occurrence of a data transition; a second filter (203) that filters the error signal, wherein the first filter and second filter are low-pass filters that possess a bandwidth that approximately equals one half of the reciprocal of: a unit interval multiplied by a maximum run length; and a divider circuit (206) that divides the filtered error signal by the filtered reference signal.
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