| 摘要 |
PURPOSE:To detect the normal peak time of input signal voltage, by providing a peak holding circuit, the first comparator, the second comparator, an inverter and an EXOR gate. CONSTITUTION:A peak holding circuit 1 stores the peak voltage up to the present point of time of changing input signal voltage Vi and outputs the same as holding voltage Vh. A comparator 3 detects that the magnitude of the difference voltage Vd between the stored peak voltage and the input signal voltage Vi exceeds reference voltage Vr1 to output comparator output voltage V3. A comparator 4 detects that the magnitude of the difference voltage Vd exceeds reference voltage Vr2 higher than the reference voltage Vr1 to output comparator output voltage V4. An inverter 5 resets the stored peak voltage on the basis of the comparator output voltage V4. An EXOR gate 6 makes the comparator output voltage V3 ineffective on the basis of the comparator output voltage V4.
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