Abstract

A waveform synthesizer adopting a superconductor-normal metal-superconductor junction array has been developed, which can generate arbitrary stepwise waveforms with a number of the quantum-voltage steps up to 1-V level amplitude. As an application of the synthesizer, we have built a sampling voltmeter which measures the differential voltages between a sinusoidal waveform produced by a semiconductor-based ac source and the Josephson waveforms. We carried out extensive sampling measurements for a 50-Hz sine wave with 1-V amplitude, applying various sampling apertures.

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