Full common gate common source reference voltage source

Abstract

The invention provides a full common gate common source reference voltage source. The full common gate common source reference voltage source includes a start circuit, a reference current source circuit and a temperature compensation circuit which are connected between a power supply VDD and a ground in parallel; the starting circuit, the reference current source circuit and the temperature compensation circuit are successively connected; an output end of the start circuit is connected to the reference current source circuit, and the start circuit is used for providing start current in power-on of the power supply and allowing a reference voltage source to break away from a degeneration bias point; an output end of the reference current source circuit is connected to the temperature compensation circuit, a common source common gate current mirror is used to improve the power supply voltage rejection ratio and the voltage regulation factor, and the reference current source circuit is used for generating the reference current; and the temperature compensation circuit is used for generating low temperature drift reference voltage, the common source common gate current mirror is used to duplicate current from the reference current source circuit, and the output voltage of the temperature compensation circuit is the output voltage Vref of the reference voltage source. The full common gate common source reference voltage source is an ultra-low power consumption full cascode reference voltage source, and can suppress power source noise well.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a full cascode common source reference voltage source. Background technique [0002] Reference voltage sources are analog-to-digital converters (ADC), digital-to-analog converters (DAC), switching regulators (SPSM, LDO, DC-DC converters, etc.), oscillators, PLLs, temperature sensors, rechargeable battery protection chips, and It is an indispensable part of analog integrated circuits such as network communication circuits and digital-analog hybrid integrated circuits. It is used to generate a voltage with high precision and high stability, which does not change with changes in ambient temperature, power supply voltage, manufacturing process, noise and other factors, and provides a reference voltage for other circuit modules. Therefore, the reference voltage source is used in analog integrated circuits. Occupy a very important position, it directly affects the performa...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of poor power supply voltage adjustment rate, excessive chip area and excessive power consumption of the traditional reference voltage source circuit, and provides a fully common-gate common source reference voltage source

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