Pulse-driven Josephson digital/analog converter [voltage standard] |
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Authors: | Benz SP Hamilton CA Burroughs CJ Harvey TE Christian LA Przybysz JX |
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Affiliation: | Nat. Inst. of Stand. & Technol., Boulder, CO ; |
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Abstract: | The authors have designed and demonstrated a pulse-driven Josephson digital/analog converter. When used as a programmable voltage standard, this device can synthesize metrologically accurate ac waveforms as well as stable dc voltages. We show through simulations that Josephson quantization produces a nearly ideal quantization noise spectrum when a junction is driven with a typical waveform produced by a digital code generator. This technique has been demonstrated in preliminary experiments with arrays of 1000 junctions clocked at frequencies up to 6 Gb/s, where sine waves of a few millivolts in amplitude were synthesized at frequencies up to 1 MHz |
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