Low startup time bandgap reference2/2/2024 ![]() This work presents a design of LDO to generate a regulated output voltage of 1.8V from 3.3V input supply targeted for 120mA load application. Detailed analysis of the noise and PSRR of an LDO is not sufficient. Therefore, a dedicated low noise and high Power Supply Ripple Rejection (PSRR) of Low Dropout (LDO) voltage regulator are needed in the later stages of system development to supply the desired load voltage. However, the harvested energy is unregulated thus it is highly susceptible to noise and cannot be used efficiently. Harvesting energy from ambient Radio Frequency (RF) source is a great deal toward batteryless Internet of Thing (IoT) System on Chip (SoC) application as green technology has become a future interest. © 2019 Institute of Advanced Engineering and Science. This paper presents a bandgap with MOS PTAT and CTAT extraction achieving a PSRR of-81dB at a Vref of 0.415V was designed on 130nm CMOS technology targeting IoT RFEH devices that operate at sub-threshold and near-threshold region that exhibits improvement over the base design. A high PSRR bandgap reference that rejects noise at the power supply is needed so that the circuitry powered by RFEH systems would be able to function properly. However, the main challenge is supplying clean and low noise power to sensitive circuits such as low power sensors, VCOs and PLLs. An RFEH power management system has promising benefits that could further improve the powering of IoT devices as it has potential for clean energy as well as other advantages which consists of a rectifier, bandgap reference and LDO as the main core. In the midst of technological advance where everything is connected via the internet, IoT is emerging as a potential solution to everything, ranging from health wearables to smart city.
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