Abstract
We report on the design, performance, and limitations of an improved multiple superconducting quantum interference device (SQUID) controller based upon a digital signal processor. The flux noise level of the dc SQUID controller system is comparable with the commercial analog system, ∼4 μΦ0/Hz1/2 at 100 Hz. The measured maximum slew rate of the system is approximately 800 Φ0/s. The current system could control up to five SQUID channels.
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