| 摘要 |
The electronic calibration equipment for verifying the high frequency characteristics of electronic test equipment, including oscilloscopes arid time interval analyzers is provided. An electronic circuit (40) for generating an electronic fast edge waveform (109, 110) of selectable amplitude comprises: a waveform output (102) from the circuitry; a plurality of attenuation stages (124-127), the attenuation stages being connected without any switching elements to each other to form a cascaded series of attenuation stages leading to the waveform output (102) and each of the attenuation stages (124-127) in the series being bounded by circuit nodes (115, 132, 133, 134, 135); one or more pulse generators (105) for producing an unattenuated source of the fast edge waveform (105, 106); and structure selectively applying the fast edge waveform source to a corresponding selected one of the circuit nodes so that the fast edge waveform propagates from the selected circuit node (115, 132, 133, 134, 135) through a selected number of attenuation stages (124-127) to the waveform output (102) thereby attenuating the fast edge waveform (109, 110) to a selected amplitude.
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