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The design considerations for a completely digitally controlled cryogenic current comparator resistance ratio bridge, including the feedback loops for voltage and current balance, are described. The numerical algorithms have been modeled and optimized, and the overall system performance is illustrated with example measurement data. It is shown that the final performance of the bridge is limited only...
The considerations for designing a completely digitally controlled cryogenic current comparator resistance ratio bridge are presented. Crucial elements in the design include low noise current sources of sufficient stability, and gain and bandwidth in the digital feedback loops, so that the final behaviour of the CCC bridge is limited by the fundamentally inevitable (1/f) noise sources of the SQUID...
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