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Optimization of a DC SQUID with Complete Flux Transformer Circuits

The design of a complete DC SQUID is discussed, taking the effects of the flux coupling circuits and resonances caused by parasitic capacitances into account. Our analysis and practical considerations suggest coupling via an intermediary transformer. A model is developed to optimize the structure: it describes the whole circuit with the help of a suitably modified autonomous SQUID. Following these design principles we have built a DC SQUID, primarily for use in biomagnetic research but also well suited for other applications. The lowest measured noise of our SQUID is 1×10-6 φ0/√Hz, indicating the success of the design.