Digital-analog hybrid linear voltage regulator system

Abstract

The invention discloses a digital-analog hybrid linear voltage regulator system. A reference voltage source of the system provides a comparison reference voltage value for an analog voltage comparator 1 and an analog voltage comparator 2; the resistance voltage division feedback network divides the output voltage to generate two voltages to be compared, and the two voltages to be compared are provided for the analog voltage comparator 1 and the analog voltage comparator 2 respectively; the analog voltage comparator 1 and the analog voltage comparator 2 are used for respectively comparing the relationship between the voltage generated by the resistance voltage division feedback network and a reference voltage and controlling the RC oscillator and the current discharge switch; the RC oscillator is used for generating a clock signal to drive the charge pump circuit; the charge pump circuit is used for increasing the grid voltage of the adjustment transistor under the drive of the RC oscillator, and the current discharge switch is used for reducing the grid voltage of the adjustment transistor. The circuit system is simple in structure, the advantages of the analog LDO and the digital LDO are combined on the basis that no large on-chip compensation capacitor exists, and good stability and transient response of the digital-analog hybrid LDO system are guaranteed.

Description

technical field [0001] The invention relates to the field of CMOS digital-analog hybrid integrated circuits, in particular to digital circuit system power supply voltage stabilization technology. Background technique [0002] Low Dropout Regulator (LDO) system, due to its simple circuit structure, low current consumption, small output voltage ripple, and high integration, is widely used in large systems such as System on Chip (SoC). scale digital system. The LDO converts a certain range of input voltage into a stable output voltage and provides it to the load circuit to ensure the stability of the power supply voltage during the operation of the SoC circuit. Under normal circumstances, the load circuit is often a large-scale digital circuit. With the different working states of the load circuit, the current demanded by the voltage source is different at different times. This requires the LDO to have strong drive capability and fast response capability to ensure The control...

AI Technical Summary

Problems solved by technology

[0006]A digital-analog hybrid linear regulator system provided by the present invention provides an alternative solution for power management in highly integrated SoCs, and solves the problem of existing analog LDO compensation High difficulty, large area, low PSRR of digital LDO, large ripple, etc.

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