| 摘要 |
PURPOSE:To detect a peak of an input signal with high accuracy without setting a signal level which becomes a reference of comparison, by inputting the input signal and a signal which has delayed the input signal, to positive and negative input terminals of a comparator, respectively. CONSTITUTION:An input terminal 2 to which an input signal VS whose peak is to be detected is applied is connected to a negative input terminal of an operational amplifier 1 being a comparator, and also, connected to a signal delay circuit 6. An output of the signal delaying circuit 6 is connected to a positive input terminal of the operational amplifier 1, and an output V0 of the operational amplifier 1 is provided to a peak detecting output terminal 5. In this state, a signal VZ which has delayed the input signal VS by a prescribed time DELTAt by a signal delaying circuit 6 is inputted to the operational amplifier as a reference voltage for comparison, by which the peak detection can be executed surely without setting the reference voltage for comparison.
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