| 摘要 |
PURPOSE:To attain stable operation by obtaining the range of a threshold level to which the maximum value of an amplitude of an input signal belongs by the 1st comparator, and selecting the identification threshold level of the 2nd comparator to give a stable threshold to the input amplitude. CONSTITUTION:When the input amplitude VMX is near a level T1,2 and the entire circuit is reset, the state is started from the threshold level T2,1 and so long as the input amplitude exceeds the T1,2, the state of the threshold level T2,1 is kept. When the amplitude exceeds the T1,2twice or over consecutively, the state of the threshold level T2,2 is obtained. Since the input amplitude is compared with thresholds level T1,1 and T1,3 in this state, the state of the T2,2 is held and made stable when the input amplitude VMX is near the T1,2. When the level is smaller than the T1,1 by 1 deg. or exceeds the T1,3 by 1 deg., the state of the T2,2 is kept. When the input amplitude VMX exceeds the T1,3 twice or over consecutively in the state of the T2,2, the state of the threshold level T2,3 is attained. |
