The effect of parasitic capacitance Cp on DC SQUID characteristics and noise performance has been studied using a test structure consisting of 11 identical SQUID washers with Nb films of various widths covering the slit. The measured I-V characteristics are in good agreement with simulations based on a simple lumped circuit model. The energy resolution ε in seems to scale roughly according to in approximately ε ≈ γkBT √L(C+2Cp), where γ is a dimensionless constant, kB is the Boltzmann constant, T is the temperature, C is the junction capacitance, and L is the inductance.
|Pages (from-to)||3013 - 3016|
|Number of pages||4|
|Journal||IEEE Transactions on Magnetics|
|Publication status||Published - 1991|
|MoE publication type||A1 Journal article-refereed|