| 摘要 |
Two all pass filters ( 11, 12 ) with 90° phase-shifted different center frequencies are employed to pass an alternating signal S with jitters in the period to generate signals S 1 and S 2 , 90° phase-shifted from each other. A pulse generator ( 22 ) generates a sampling pulse Sp by detecting a zero cross point of the phase-shifted signal S 2 . A full-wave rectifier ( 21 ) rectifies full waves of the phase-shifted signal S 1 and provides a rectified output to a sampling circuit ( 23 ), which extracts a peak value of the amplitude at the timing of the sampling pulse Sp.
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