研究目的
To propose and test a new method for the calibration of digitizers using the Josephson Arbitrary Waveform Synthesizer (JAWS) to generate a complex waveform for simultaneous calibration of gain at different frequencies and amplitudes, and to evaluate the stability of the gain.
研究成果
A new method for calibration of digitizers using JAWS has been proposed and tested. The special waveform prepared allows for fully automated calibration of many parameters of the digitizer under test, showing that stability can differ substantially for different frequencies and amplitudes of the applied signal.
研究不足
The method calibrates the digitizer gain only at 16 points. Adding more points increases the waveform length, complicating stability evaluation for shorter observation times. Data processing of such waveforms is complicated but can be automated.
1：Experimental Design and Method Selection:
The method involves generating a complex waveform using JAWS to calibrate the digitizer's gain at different frequencies and amplitudes simultaneously. The waveform consists of 4 sections and 4 subsections, each containing 10 periods of a single tone sine wave with varying frequencies and amplitudes.
2：Sample Selection and Data Sources:
A 24-bit National Instruments PXI 5922 digitizer was used to measure the waveform generated by the JAWS.
3：List of Experimental Equipment and Materials:
Josephson Arbitrary Waveform Synthesizer (JAWS), National Instruments PXI 5922 digitizer, platinum resistance temperature sensor.
4：Experimental Procedures and Operational Workflow:
The digitizer was set up to measure the waveform for several hours. Measured samples were cut to particular subsections, and three algorithms (FFT, PSFE, NLF) were used to calculate amplitude, phase, and frequency.
5：Data Analysis Methods:
The stability of amplitude, frequency, and phase was estimated using Allan deviation (ADEV) and overlapped Allan deviation (OADEV).
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