Abstract：Aiming at the problems in measurement of delay time of amplifiers, such as the large difference between two sampling signals, a novel measurement method based on four-parameter sinusoidal curve-fit method was presented. Based on turning the phase difference into time difference, the delay of amplifiers was measured. Some problems about measurement were discussed. They were the coarse errors of periodic phases, big errors of negative amplitude, modification of delay between two sampling channels of data acquisition its self, all of them were discussed and analyzed in details, and the resolution method were given out. The measurement uncertainty was analyzed. In experiment, both the validity and the feasibility of the measurement method were proved. The experiment showed that the delay of amplifiers has inherence stability itself, it is indifferent to the stimulus frequency, amplitude, and waveforms. The delay measurement method above can be applied in all the measurement of delay of the amplifiers, filters, attenuators, etc.
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2019, Vol. 40 
