A High Gain 0.0831μV/mA Load Regulated Capacitorless LDO with Fast Loop and Nested Miller Compensation (NMC)

In recent years, there has been a spike in demand for wearable devices. Low dropout regulators are an integral part of these devices, owing to their high Power Supply Rejection (PSR) and stable output. This paper proposes a high gain, low quiescent current $(10.298\mu \mathrm{A})$, Output Capacitorless Low Dropout Regulator (OCL-LDO) with a fast local loop and unity feedback. Nested Miller frequency Compensation (NMC) technique is used to stabilize the system. The proposed circuit can operate with a load current ranging from $20\text{pA}$ to 20mA. The design encompasses three gain stages with a total open loop gain of 132 dB resulting in enhanced load regulation (0.0831 µV/mA) and line regulation (0.6917 mV/V). The proposed LDO has been simulated in gpdk 90nm CMOS technology using Cadence Virtuoso. The simulation results demonstrate a PSR of −61.03 dB and −41.17 dB at 1kHz and 10kHz respectively.