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Journal of Communications Technology and Electronics

A quantum digital ac-voltage synthesizer based on pulse-width modulation of the Josephson junction bias current

Олег Викторович Карпов, Victor Matveevich Buchstaber, M. A. Tertychnaya, Сергей Иванович Тертычный, С. В. Шерстобитов

Published Feb 1, 2009• 2 citations
Publisher

Abstract

The theory and preliminary results of the experimental tests of a method for synthesizing ac-voltage signals through the use of pulse-width modulation of the microwave power biasing a Josephson junction are presented. It is shown that it is possible to synthesize sinusoidal ac-voltage signals with an amplitude of 1 V and a nonlinear distortion factor of <0.003%.

DOI
10.1134/s1064226909020181

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The theory and preliminary results of the experimental tests of a method for synthesizing ac-voltage signals through the use of pulse-width modulation of the microwave power biasing a Josephson junction are presented. It is shown that it is possible to synthesize sinusoidal ac-voltage signals with an amplitude of 1 V and a nonlinear distortion factor of <0.003%.
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The paper is about development of the lumped Josephson junction arrays (JJAs) for the generation of accurate quantum-based ac voltages. By using semiconductor pattern generators, it was possible to synthesize unipolar and bipolar waveforms with amplitudes of almost 10 mV and frequencies of up to 122 kHz. Higher harmonics and other unwanted noise signals were suppressed by -90 dBc. Because of the unique layout of our JJA, it was possible to connect the circuit directly to the ground, thereby eliminating common-mode signals
Quantum Digital-to-Analog Converters (DACs) based on programmable Josephson array (PJVS) represent the most advanced devices currently employed in ac voltage calibrations. Pulse-driven Josephson technology, compared to PJVS, provides cleaner and faster voltage signals and is the main topic of frontier developments. Although the extension of PJVS frequency range appears to be arduous, some enhancement are still practicable. In this work we demonstrate the possibility of synthesizing stepwise quantum voltage waveforms with half of the bias lines and fewer Josephson junctions by exploiting both first and second Shapiro steps, with no losses in terms of performances.