A Low Power Subthreshold CMOS Bandgap Reference Voltage Circuit

Abstract

The invention belongs to the technical field of simulation integrated circuits, and discloses a low-power-consumption sub-threshold type CMOS band gap reference voltage circuit. The circuit comprises a start circuit, a reference current source generation circuit, a voltage division circuit and a reference voltage output circuit. The start circuit is used for enabling a reference voltage source to get rid of a zero degeneracy point and to work under specific work voltage. The reference current source generation circuit is used for generating current to provide bias for a rear end circuit, and MOS transistors in the rear end circuit all work in a sub-threshold region. The voltage division circuit is used for enabling an output circuit to reach required technical indexes and generating a negative temperature coefficient. The reference voltage output circuit is used for generating voltage with a positive temperature coefficient and making the output voltage Vref have the zero temperature characteristic. The low-power-consumption sub-threshold type CMOS band gap reference voltage circuit has the advantages of being low in work voltage, low in power consumption and low in temperature coefficient.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and relates to a low-power consumption sub-threshold CMOS bandgap reference voltage circuit, which can be used as a power supply device in portable electronic products. Background technique [0002] The reference voltage source is an important module in analog integrated circuits, digital-analog mixed-signal integrated circuits, and system integrated chips. The purpose of generating a reference is to establish a DC voltage that has nothing to do with power supply and process and has definite temperature characteristics. It provides DC for the system. The reference voltage is widely used in power devices, such as the DC reference voltage in low-dropout linear regulators (LDOs), and its accuracy and stability directly determine the accuracy of the entire system. With the rapid development of the wireless communication industry and the wide application of portable electronic produ...

AI Technical Summary

Problems solved by technology

However, due to the existence of operational amplifiers in traditional bandgap reference voltage sources, it is extremely difficult to design operational amplifiers that can work at lower voltages and have low offset in order to achieve low power consumption, and the circuit structure is complex. It occupies a large chip area and is limited by the process. Its operating voltage is greater than 1.2V, which consumes a lot of energy and no longer meets the requirements of low-voltage and low-power consumption of today's electronic products.

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