Circuit: * Z:\home\maximilian\UppSense\ltspice\transimpedance_amplifier\012transimpedance_ltc6269_three_res_ac_sweep.asc Direct Newton iteration failed to find .op point. (Use ".option noopiter" to skip.) Starting Gmin stepping Gmin = 10 Gmin = 1.07374 vernier = 0.5 vernier = 0.25 vernier = 0.125 Gmin = 1.02385 vernier = 0.0625 vernier = 0.03125 vernier = 0.015625 Gmin = 1.01955 vernier = 0.0078125 vernier = 0.00390625 Gmin = 1.0126 vernier = 0.00520833 vernier = 0.00260417 vernier = 0.00130208 Gmin = 1.00833 vernier = 0.00173611 vernier = 0.000868055 Gmin = 1.00614 vernier = 0.00115741 vernier = 0.000578703 vernier = 0.000771604 Gmin = 1.00481 vernier = 0.000578703 vernier = 0.000771604 vernier = 0.000578703 Gmin = 1.00394 vernier = 0.000434027 Singular matrix: Check node u1:n013 Iteration No. 9 Gmin = 0 Singular matrix: Check node u1:n013 Iteration No. 1 Gmin stepping failed Starting source stepping with srcstepmethod=0 Source Step = 3.0303% Source Step = 33.3333% Source Step = 63.6364% Source Step = 93.9394% Source stepping succeeded in finding the operating point. Date: Thu Jul 06 15:44:11 2017 Total elapsed time: 0.132 seconds. tnom = 27 temp = 27 method = trap totiter = 5358 traniter = 0 tranpoints = 0 accept = 0 rejected = 0 matrix size = 17 fillins = 21 solver = Normal Matrix Compiler1: 110 opcodes Matrix Compiler2: off [0.3]/0.5/1.1