Digitizer Linearity Measurement with a Josephson Arbitrary Waveform Synthesizer

This article examines the non-linearity and gain error of a commercial digitizer on the 100 mV range with a Josephson Arbitrary Waveform Synthesizer (JAWS) as a reference. Different digitizer input filter settings were studied, and the shortest aperture of the digitization window was chosen to maximize the processing speed. The results revealed a maximum non-linearity of 0.3 μV on the 100 mV range with the digitizer filter frequency set to 100 kHz. A gain stability over 12 hours was determined to be 0.92 μV/V.