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This brief presents a simple and power-efficient impedance adapting compensation scheme for high current NMOS low-dropout regulators (LDOs). By the proposed technique, the low-frequency node impedance retains to high value, while the high-frequency impedance is greatly attenuated. Therefore, both high gain and decent transient response is achieved simultaneously. Besides, the proposed impedance adaption waived the need for a commonly required power-hungry driver circuit, leading to a more simplified and energy-efficient design. In addition, the load-tracking technique is applied to further cancel the effect of load current variations, and helps achieve decent frequency and transient responses over a wide load range. Fabricated in a 0.35 μm CMOS process, the chip regulates an output voltage form 0.8 V to 1.8 V with 6 A current capacity and 114 mV maximum dropout voltage. The measurement …