With the rapid development of the electronic information industry, electronic products have penetrated into all aspects of daily life. Power management technology plays an important role in various electronic products with complex functions. LDO linear power regulators have been widely used in electronic products with their advantages such as wide input voltage range, low voltage drop, low power consumption, simple structure, small chip area, and high power supply rejection ratio. This paper introduces the basic principles and performance parameters of LDO linear power regulators. By designing a 3.3V to 1.8V LDO linear power regulator, the design and optimization of LDO are discussed in detail, including the design optimization of bandgap reference, error amplifier, and power tube. In the design process, this paper especially uses a high-gain error amplifier to effectively improve the load adjustment ability of the circuit. The maximum current of the output load can reach 300mA. Through resistor and capacitor series compensation, the LDO can work stably under large capacitance and large load current. Finally, the designed LDO linear power regulator is simulated at the circuit level based on the SMIC0.18umCMOS process using CadenceSpectre software. Through simulation, we verified the various performance parameters of the circuit, and the results showed that the designed performance was basically achieved.
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