A high precision low dropout regulator with nested feedback loops

A high precision low dropout regulator (LDO) with nested feedback loops is proposed in this paper. By nesting a zero-tracking compensation loop inside of the negative feedback loop comprising an Error Amplifier, the independence of off-chip capacitor and ESR is ensured for different load currents and operating voltages. Therefore, in low Iddq or low voltage scenarios, the total error of the output voltage caused by line and load variations is less than ±3% according to on-silicon measurement results.