Abstract
A low dropout (LDO) voltage regulator operated at 5 V power supply, along with a bandgap reference (BGR) voltage circuit with high power-supply rejection ratio (PSRR) is introduced. In the suggested LDO circuit, a low-pass filter for creating a common gate to transmit supply voltage to the power transistor gate is used. During deployment of the RC filter, an artificial resistor with a value of infinity is utilised, which in addition to reduce the chip occupied area, improves the performance of the low-pass filter at frequencies close to DC, and thus improves the PSRR at these frequencies. In addition, the high PSRR of the circuit is mediated by a low-voltage current mode regulator at the heart of the bandgap circuitry, which isolates the bandgap voltage from power supply variations and noise. The isolating current mirrors create an internal regulated voltage ( V reg ) for BGR core and op-amp rather than the V DD . These current mirrors reduce the impact of supply voltage variations. The circuit topology is discussed and simulation results are provided. The LDO is also stable without an output capacitor.
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