| 摘要 |
PURPOSE: A method is provided which realizes a gain control part of a digital oscilloscope having a wide bandwidth with a simple structure by removing a variable gain amplifier by using a high resolution analog to digital converter. CONSTITUTION: A conventional digital oscilloscope comprises a gain control part constituted with an attenuator(31) and a variable gain amplifier amplifying or attenuating a signal according to an amplitude of an input signal, and an analog/digital converter converting the input signal into a digital signal and a data processor(40) and a display part. The gain control part controls the gain by a method of replacing the variable gain amplifier by a software multiplication operation by connecting the A/D converter of a high resolution to a next stage of the attenuator for a signal to be inputted to the A/D converter from the attenuator.
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