CMOS低压差线性稳压器的多目标性能优化设计OA

A combined method of manual and algorithmic design is adopted to implement a CMOS low dropout regulator(LDO)circuit with a stable output voltage of 1.8V.By taking the temperature coefficient(TC),power supply rejection ratio(PSRR),and output noise(NOISE)of LDO as performance optimization objectives,and the size of core MOSFET devices as design variables,a circuit model is es-tablished based on response surface methodology(RSM)and nonlinear mapping of response parameters is performed.Finally,the optimiza-tion solution of multi-objective performance combination is achieved.A circuit response surface model is constructed using only 29 sets of sampled data.The experiment proves that the optimization results based on RSM algorithm can accurately match the actual simulation data after optimization,verifying the effectiveness of the optimal performance solutions for TC,PSRR,and NOISE.Compared with the results of before-algorithm optimization,the post simulation results show that TC decreases from 16.31×10-6/℃to 14.92×10-6/℃,PSRR increases from-85.64 dB to-112.29 dB,and NOISE decreases from 39.36 μV to 27.16 μV.