Performance optimization for LDO regulator based on the differential evolution An application of differential evolution for parameter optimization in the low dropout regulator (LDO) is presented in this paper. The parameters optimization by manual work for the analog integrated circuit, such as LDO, is laborious and timeconsuming, and it is uncertain to find the relatively good result. In this paper, the differential evolution is used to optimize the parameters and find the relatively good performance of LDO. In order to improve the convergence speed and optimization effect, a new constraint solution and a fast weightbased nondominated sorting method are proposed. Simulation results show that the gainbandwidth product,load regulation and line regulation are improved by 206.5%, 58.1% and 87.6%, respectively, compared with the manual solution.

A PowerAreaEfficient LowDropout Regulator With Enhanced Buffer Impedance Attenuation This paper proposed a lowdropout regulator (LDO) with a dynamicbiasing super buffer technique and a 2stage error amplifier (EA). The 2stage EA provides a high loop gain and wide output swing so as to implement an ultra small load regulation and line regulation. The dynamicbiasing super buffer technique, made of super source follower, ultra lowoutput impedance buffer and dynamic biasing technique, ensures the stability of the LDO with a 1xc2xb5F output capacitance and adjusts the quiescent current (Iq) of the LDO in different load current so that an ultra low I q  is achieved by the proposed LDO structure. Based on Global Foundry 0.18xc2xb5m CMOS process, the circuit can drive up to 200mA load current at 1.2V output voltage in 1.4V 2V supply voltage (Vs). In 1.4Vs, Iq is 26.3xc2xb5A in no load and 57.7xc2xb5A in full load. In 2Vs, Iq is 26.4xc2xb5A in no load and 246.2xc2xb5A in full load. The load regulation is 1.12xc2xb5VmA in 1.4Vs and the line regulation is 0.50mVV in 200mA full load.