express_L_filter.m HPF_RC_OPAmp_design.m L_imp_matcher.m ladder_xfer_ftn.m LPF_ladder_coef.m LPF_RC_OPAmp_design.m pi_imp_matcher.m T_imp_matcher.m elec05e06.m elec05s2_1.m MATLAB_PSpice_for_Electronic_circuits_Ch5.pps license.txt