An ultra-low power consumption and low ripple voltage reference circuit

Abstract

The invention discloses an ultralow power consumption and low-ripple voltage reference circuit. The ultralow power consumption and low-ripple voltage reference circuit comprises a start-up circuit, a current source module, a negative temperature coefficient voltage generation module, a unit gain operational amplification buffering module and a positive temperature coefficient voltage generation module, wherein the start-up circuit is used for correctly starting up the current source module when being powered on; the current source module is used for generating pA-grade current output which is not related with power supply voltage; the negative temperature coefficient voltage generation module is connected with the current source module and is used for generating CTAT (Complementary To Absolute Temperature) voltage output with negative temperature properties; the unit gain operational amplification buffering module is used for separating the voltage output with the negative temperature properties, which is output by the negative temperature coefficient voltage generation module from a post-stage circuit; the positive temperature coefficient voltage generation module is used for generating PTAT (Proportional To Absolute Temperature) voltage output with positive temperature properties and adding the PTAT voltage output with the CTAT voltage output with the negative temperature properties, which is output by the negative temperature coefficient voltage generation module, so as to generate zero temperature coefficient voltage output. The voltage reference circuit with ultralow power consumption, a small area, low working voltage and low-ripple coefficients is realized.

Description

technical field [0001] The invention relates to a voltage reference circuit, in particular to an ultra-low power consumption and low ripple voltage reference circuit. Background technique [0002] The voltage reference circuit has the advantage of being independent of the power supply voltage, process, and temperature, and is widely used in analog integrated circuit design modules such as analog-to-digital converters (ADC), digital-to-analog converters (DAC), LDO voltage regulators, and high-precision comparators. . With the development of today's portable electronic devices, the popularity of the Internet of Things and smart sensors, low-power chip design is getting more and more attention; as chip design enters the nanoscale era, the working voltage of the chip is also reduced with the progress of the process; therefore , the voltage reference source with low power consumption, low voltage and high output accuracy has become a research hotspot today. [0003] The usual w...

AI Technical Summary

Problems solved by technology

[0005] 1) The power consumption is large, and the working current is mostly uA level, and some ultra-low power consumption voltage references only reach the working current of 100nA;

[0006] 2) Using large resistors in the chip occupies a large area of ​​the chip;

[0007] 3) The working voltage is too high, about 1.5V ~ 3V;

[0008] 4) The output voltage is relatively large, which limits the power consumption of the chip;

[0009] 5) The output voltage ripple of the voltage reference source is relatively large

Images