研究目的
To provide traceability for the phase of the harmonics, relative to its fundamental, of a distorted waveform using the Josephson arbitrary waveform synthesizer.
研究成果
The JAWS gives consistent results as a standard for the phase of harmonics of a distorted signal for different JJAs and the biasing electronics. The system can generate distorted signals with phase uncertainty of the harmonics from 0.002° to 0.010° (k=2.0), depending on the harmonic magnitude and harmonic number.
研究不足
The memory size of the pattern generator limits the lowest fundamental frequency to approximately 56 Hz. The phase uncertainty of the harmonics depends on the harmonic magnitude and harmonic number, ranging from 0.002° to 0.010° (k=2.0).
The JAWS system contains a continuous wave generator, a tertiary pattern generator, two broadband radio frequency (rf) amplifiers, two arbitrary waveform generators (AWGs), two voltage-to-current converters and two NIST Josephson junction arrays (JJAs). The inputs and outputs of the rf amplifiers are connected through a combination of dc-blocks and attenuators, optimized for the maximum step current margins of the JJAs. A 24-bit flexible resolution digitizer is used to check the quantization of the JJAs. The JJAs are programmed to produce two arbitrary waveforms of the same harmonic content and rms values with a relative phase difference of 180°. The memory size of the pattern generator limits the lowest fundamental frequency to approximately 56 Hz.
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