Charles J. Burroughs

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We have synthesized and measured ac and dc voltages using a Josephson arbitrary waveform synthesizer. On-chip filtering has enabled the first practical operating margins for ac and arbitrary waveforms. Using a digital voltmeter, we demonstrate the operating margins and linearity of 101 synthesized dc voltages and confirm the flatness of a single voltage(More)
We have performed a variety of precision measurements by comparing ac and dc waveforms generated by two independent ac programmable Josephson voltage standard (ACPJVS) systems. The objective of these experiments was to demonstrate the effectiveness of using a sampling digital voltmeter to measure small differences between Josephson waveforms for frequencies(More)
The output voltage of Programmable Josephson Voltage Standard (PJVS) circuits has reached the 10 V benchmark, which was set over twenty years ago by conventional dc Josephson Voltage Standard (JVS) systems. The nonhysteretic Josephson junctions in these next-generation 10 V PJVS systems enable a number of advantages and additional features as compared with(More)
Previous study has shown that niridazole (NDZ) is dysmorphogenic to rat embryos between days 10 and 11 under culture conditions including 5% oxygen. Other studies have found that reductive embryonic biotransformation is required but that covalent binding is not a major basis of this embryotoxicity. In research presented here, NDZ exposure of homogenates(More)
We have measured stepwise-approximated sine waves generated by a programmable Josephson voltage standard (PJVS) with several different output configurations. These data are analyzed to characterize the dominant error mechanisms for RMS applications, such as ac–dc difference measurements of thermal voltage converters (TVCs). We present detailed explanations(More)
where k is Boltzmann’s constant. We have built a system that uses a digitally synthesized Quantized Voltage Noise Source (QVNS) which uses an array of Joesphson junctions as an ac-voltage reference to correct for the nonideal performance of the electronic systems used to measure the noise. The QVNS is used to emulate resistor noise with a constant spectral(More)