A High-Precision Low-Noise Low-Dropout Linear Regulator Circuit
Based on the existing products,a high-precision,low-noise and low-dropout linear voltage regulator circuit is designed.A folded cascode amplifier is designed to reduce noise and improve gain.The PMOS transistor is used to replace the resistor in the overheat protection circuit,which reduces the power consumption.At the same time,the gate drive structure and current control mode are used to realize the turn-on and turn-off of the switch tube.Based on TSMC 0.35 μm BiCMOS process and Cadence software,the design,layout drawing and pre-and post-simulation are carried out,and the relevant parameter values are obtained in the post-simulation.The parameters are analyzed in detail,and the power supply voltage rejection ratio at different frequencies is compared.The experimental results show that the design has achieved the design goal of high precision and low power consumption.
LDOAmplifierOver heat protectionSupply voltage rejection ratio
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