Sub-threshold full CMOS reference voltage source

Abstract

The invention discloses a sub-threshold full CMOS reference voltage source. A start-up circuit helps a reference voltage source from getting rid of a degeneration bias point to enter the normal working state. A sub-threshold operation amplifier is ensured to run at low power consumption while being larger in gain at the same time. In this way, the voltage rejection ratio of the power supply is increased. An Nano-ampere reference current generating circuit generates a Nano-ampere-level reference current and suppresses the generation of the noise of the power supply so as to provide a current bias for a reference voltage generating circuit. The reference voltage generating circuit is composed of two MOS tube gate voltage differences of different standard voltages, wherein a reference voltage independent of the temperature is obtained through the coadjustment process. According to the invention, no passive resistor, diode or triode is adopted, and the sub-threshold full CMOS reference voltage source is compatible with the standard CMOS process. Therefore, the layout area is greatly reduced, and the production cost is lowered. The sub-threshold full CMOS reference voltage source is small in power consumption, high in power supply rejection ratio, low in temperature drift coefficient and low in power supply voltage regulation rate.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a sub-threshold full CMOS reference voltage source. Background technique [0002] The voltage reference source is an indispensable module in analog integrated circuits and hybrid integrated circuits. It is commonly used in circuit systems such as analog-to-digital converters (ADC), digital-to-analog converters (DAC), power amplifiers, and DC-DC converters. It is used to generate a voltage reference that does not change with the power supply voltage and temperature, and provides a reference voltage for other circuit modules, and its characteristics greatly affect the performance of the entire system. [0003] With the continuous increase of integrated circuit system integration, low voltage and low power consumption become more and more important. However, the traditional bandgap reference voltage source consumes a lot of power due to the large current required, and needs...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the performance of the existing reference voltage source is not good enough to provide a sub-threshold full CMOS reference voltage source

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