Waveform sampling apparatus

摘要

Disclosed is a waveform measuring apparatus in which an integration period T can be discretionally set to a value in accordance with the analog voltage cycle of the device being measured with a simple circuit configuration. The waveform measuring apparatus has an integrator circuit for integrating a fixed repeat-cycle analog input voltage during a period when a gate is ON and the waveform measuring apparatus converts the analog input voltage based on the integrated output of the integrator circuit. By use of a control portion consisting of a gate controller and a phase shifter, the first cycle of a period covering 2 cycles of the analog input voltage is deemed to be a first integration period and the second cycle thereof is deemed to be a second integration period; during the first integration period the gate ON/OFF is controlled using a control signal which alternates repeatedly between ON/OFF at each unit cycle corresponding to a unit integration time and during the second integration period the gate ON/OFF is controlled with a signal which is the inversion of the control signal.