E/D NMOS reference voltage source and low-dropout voltage regulator

Abstract

The invention provides an E / D NMOS reference voltage source and a low-dropout voltage regulator. In the E / D NMOS reference voltage source, no matter how the external power supply voltage changes, the pre-reference output voltage can be stabilized to be a fixed value through the pre-reference source circuit based on the N-channel junction field effect transistor, the range of the pre-reference output voltage is wide, and the process is convenient to adjust; due to the fact that the pre-reference source circuit bears withstand voltage and initial voltage stabilization, the input voltage of the E / D NMOS reference source circuit is slightly changed by power supply voltage, the wide input voltage range and the power supply rejection ratio of the E / D NMOS reference source circuit are greatly improved, and the E / D NMOS reference source circuit has the E / D NMOS reference micro-power-consumption property at the same time. The E / D NMOS reference voltage source is simple and reasonable in circuit structure, a triode, a resistor, a capacitor and the like are not needed, the manufacturing process of the E / D NMOS reference voltage source is only based on the silicon gate P well E / D CMOS process, manufacturing of the N-channel junction field effect transistor is added, only the threshold voltage of the N-channel junction field effect transistor needs to be adjusted in the process, the process is greatly simplified, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power supply management, in particular to an E / D NMOS reference voltage source and a low dropout voltage regulator. Background technique [0002] In the power management circuit design of analog integrated circuits, the reference voltage source determines the performance index of the low dropout power supply. At present, there are many kinds of reference voltage sources, including Zener reference source, bandgap reference source, bandgap reference source with second-order compensation, E / D NMOS reference source with high power supply rejection ratio and other structures. [0003] Among them, the Zener reference voltage source adopts a bipolar circuit structure combined with a Zener diode with technological characteristics to achieve high performance of the Zener reference source; the bandgap reference source adopts a standard bandgap structure to achieve high-performance bandgap reference output; The ban...

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult for the above reference voltage sources to meet the requirements of high voltage (40V), high power supply rejection ratio (60dB), and low power consumption (≤10uA) at the same time. Applications of low dropout voltage regulators

Images