| 摘要 |
PURPOSE:To detect the peak of an input signal at its substantial peak position by comparing an input with a reference voltage and using an AND gate output so as to detect the peak point below the reference voltage. CONSTITUTION:An input signal A shown in waveform (a) is inputted to a differential circuit 1, where a differentiation output B is obtained, and it is inputted to a zero cross comparator circuit 2, and the output D of a rectangular wave front edge pulse circuit 3 receiving the zero cross comparator output C represents an output shown in pulse waveform (d) at all peak points of the input signal A and is inputted to an AND circuit 6. On the other hand, the output E of a comparator circuit 4 being the result of comparison between a reference voltage VREF of a prescribed level and the input signal A is inputted to the AND circuit 6 as an inverted output shown in waveform (f). When two input signals D, F are at H level in respective waveforms (d, f), the result is extracted as the output G of the circuit 6 to detect peak points of the analog input signal A at the prescribed level of the reference voltage VREF or below. |
