Abstract
A computer model for the dc SQUID is described which predicts signal and noise as a function of various SQUID parameters. Differential equations for the voltage across the SQUID including the Johnson noise in the shunted junctions are integrated stepwise in time. Noise-rounded I-V characteristics are computed as a function of applied flux, Φ a , and ring inductance, L. A measure of the SQUID response, dV/dΦ a , is calculated as a function of bias current. Low frequency voltage power spectral densities S\min{v}\max{o} computed for various Φ a and L show considerable variation from the corresponding single junction Values. The flux resolution (S\min{v}\max{o})^{1/2}/ (dV/d\Phi_{a}) as a function of bias current is computed for several values of L and Φ a . The results are in good agreement with experiment.
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