Hybrid models for SQUID behavior

The paper deals with the computer aided analysis of weakly coupled Josephson junctions submitted or not to applied magnetic fields. A comparative study was made between the analytical solutions provided by specialty literature for currents phase variations and those obtained after original simulation. As remarkable differences were revealed, some original formulas were deduced, validated through programs that operate symbolical (written in MATHEMATICA) and error computations were done. The original formulas provide better approximation of solutions, the approximation errors being significantly reduced.