| 摘要 |
PURPOSE:To eliminate the influence of a DC drift and to reproduce stable magnetism inverted pulses by using the output of the phase comparator of a PLL so as to read the center slice level of an integral waveform and reduce a shift in the peak position of a pulse. CONSTITUTION:The output of a regenerative amplifier 8 is waveformshaped through an integration circuit 9 and a comparator 10 and made into pulses 6 by a pluse generating circuit 11. The slice level 32 of the comparator 10 is corrected so as to eliminate the influence of a shift due to a drift. Information for the correction is obtained by comparing a frequency increase signal 24 and a decrease signal 25 as the output of the phase compartor 16 of the PLL circuit 30 with gate signals 22 and 23 for identifying the slope direction of the integral waveform 5 by a comparing circuit 15 and then passing the obtained slice level increase signal 20 and level decrease signal 21 through an LPF13. Consequently, the problem of the drift, etc., of the integration circuit is eliminated to obtain a magnetism inverted pulse regenerating circuit using the integration circuit. |
