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Pulse-bias electronics and techniques for a Josephson arbitrary waveform synthesizer



Samuel P. Benz, Steven B. Waltman


The Josephson arbitrary waveform synthesizer (JAWS) is a series array of thousands of superconducting Josephson junctions that are biased by current pulses such that array produces voltage waveforms with quantum accuracy. Intrinsically accurate voltage waveforms synthesized with the quantized pulses from Josephson junctions were first demonstrated in 1996 [1]. Ten years later, a commercial ac standard was calibrated at an output root-mean-square (rms) amplitude of 100 mV with the first practical superconducting digital-to-analog converter [2]. Since then, many different bias techniques, pulse-drive electronics, and device technology were developed and improved in order to achieve a maximum 138 mV output rms voltage per Josephson array [3]. In this paper, we report new bias electronics and demonstrate two new pulse bias techniques. The first technique has demonstrated 250 mV output rms voltage per 6400-junction array and may enable a practical 1 V system with only four arrays. The second bias technique reduces inductance-related error signals at the signal frequency and should reduce systematic errors for waveforms with frequencies greater than 1 MHz.
IEEE Transactions on Applied Superconductivity


Digital-analog conversion, Josephson arrays, Quantization, Signal synthesis, Standards, Superconducting integrated circuits, Voltage measurement


Benz, S. and Waltman, S. (2014), Pulse-bias electronics and techniques for a Josephson arbitrary waveform synthesizer, IEEE Transactions on Applied Superconductivity, [online], (Accessed February 29, 2024)
Created July 11, 2014, Updated November 10, 2018