High-power supply rejection ratio, low-noise low-voltage difference linear voltage stabilizer

Abstract

The invention provides a high-power supply rejection ratio, low-noise low-voltage difference linear voltage stabilizer, comprising a bandgap reference voltage source, a front positioned voltage regulator, a lowpass filter, a low-voltage difference linear voltage stabilizer for providing a work power supply and an output level low-voltage difference linear voltage stabilizer; the bandgap voltage source provides a reference voltage for the front positioned voltage regulator and the low-voltage difference linear voltage stabilizer for providing the work power supply; the output voltage of the low-voltage difference linear voltage stabilizer for providing the work power supply is used as the work voltage of the front positioned voltage regulator and an output level low-voltage linear voltage stabilizer; the reference voltage generated by the bandgap voltage source passes by the front positioned voltage regulator and the lowbass filter to provide the reference voltage for the output level low-voltage linear voltage stabilizer; the output level low-voltage linear voltage stabilizer comprises at least two same second level low-voltage difference linear voltage stabilizers; outputs of all second level low-voltage difference linear voltage stabilizer are independent. The low-voltage difference linear voltage stabilizer has the performance of low noise and can independently output in a multipath mode.

Description

technical field [0001] The invention relates to the technical field of power management equipment, in particular to a low-dropout linear voltage regulator with high power supply rejection ratio and low noise. Background technique [0002] A low-dropout linear regulator (LDO, Low-dropout Regulator) is a very important power management module, which is widely used in handheld devices and portable electronic products. Since LDO has good output voltage ripple, good power supply rejection ratio (PSRR, Power Supply Rejection Ration), and low noise performance characteristics, radio frequency (RF) circuits generally use LDO for power supply. As the RF circuit system becomes more complex and more integrated, such as low-noise amplifier (LNA), mixer, high-frequency phase-locked loop (PLL), and inductor-capacitor voltage-controlled oscillator (LC VCO) all need to have The LDO with high PSRR and low noise is used for power supply, and in practical applications, in order to ensure the ...

AI Technical Summary

Problems solved by technology

However, these methods will increase the resistance in the path of transmitting large current, thereby increasing power consumption.

[0012] In summary, figure 1 The typical LDO circuit structure shown does not provide high PSRR and low noise performance

Although it can be improved by improving the structure of some local circuits, it will bring some additional problems at the same time, and it is difficult to meet the performance of high PSRR and low noise at the same time

Images