Phase detector for timing recovery loop
A timing recovery and timing error technology, applied in the field of signal processing, can solve the problems of high loss of lock rate, timing recovery phase detector can not work correctly, reduce system throughput, etc., to achieve the effect of reliable detection
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[0018] figure 2 is a block diagram of a read channel 200 for a hard disk drive using a "soft" phase detector 230, the subject of the present application. Similar to read channel 100 of FIG. 1 , read channel 200 receives an analog input signal 221 corresponding to data stored on the hard drive and generates a digital decoded output signal 229 representative of the data stored on the hard drive. . figure 2 Components 222-236 and signals 221-237 of FIG. 1 are similar to components 122-136 and signals 121-137 of FIG. 1, respectively. In addition to the phase detector 230, figure 2 Each of the elements of FIG. 1 works in a similar manner to the corresponding elements of FIG. 1 .
[0019] Unlike the phase detector 130 of FIG. 1 which generates an estimated timing error signal 131 based on the equalized digital signal 125 from the equalizer 124 and only the sign bit of the LLR value 127 from the soft detector 126, figure 2 A phase detector 230 generates an estimated timing error ...
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