Comparison of Two Internal Miller Compensation Techniques for LDO Regulators

Internal frequency compensation is required to achieve stable operation of fully integrated Low Dropout (LDO) regulators without relying on an external μF capacitor at the output node. This paper evaluates the performance of two Miller-based frequency compensation strategies: current buffer LDO (CB-LDO) and Basic Miller LDO (BM-LDO), both using a two-stage LDO core. Parameters such as overshoot, undershoot, settling time, power consumption and dropout voltage are measured and compared for 1.8V regulated output LDOs, verifying the impact of the compensation technique on the time response of the regulators.