Band-gap reference voltage source circuit

Abstract

The invention relates to a band-gap reference voltage source circuit. The circuit comprises a core circuit, a negative feedback loop, a current mirror structure and a starting circuit, wherein the core circuit is used for generating band gap voltage, an input end of the core circuit is connected with the starting circuit, an output end of the core circuit is connected with the current mirror structure, and the output driving capacity of the voltage source circuit is improved through the current mirror structure; and the negative feedback loop is arranged among the core circuit, the starting circuit and the current mirror structure, and stability of the output voltage is ensured by the negative feedback loop. The band-gap reference voltage source is processed through the CMOS technology, the voltage source circuit can effectively increase the loading capacity and reduce the temperature coefficient of the output voltage on the basis of reducing the output noise, and the band-gap reference voltage source has advantages of being low in output noise, low in temperature coefficient and large in output driving capacity. The circuit can be widely applied to super-large-scale integrated circuits in the fields of microelectronics and solid-state electronics.

Description

technical field [0001] The invention relates to ultra-large-scale integrated circuits in the fields of microelectronics and solid-state electronics, in particular to a bandgap reference voltage source circuit with large output driving capability and low output noise. Background technique [0002] Because the bandgap reference voltage source can output a stable voltage value under the condition of power supply voltage and temperature changes, it is often used in analog circuits, digital circuits, and digital-analog hybrid circuits, such as bias voltage sources for operational amplifiers, as data The reference voltage source of the converter, etc. With the rapid development of integrated circuits, the requirements for circuit precision continue to increase. The accuracy of the reference voltage source directly affects the accuracy of the data converter, so the demand for low-noise reference voltage sources is extremely urgent in recent years. [0003] In response to the dema...

AI Technical Summary

Problems solved by technology

[0003] In response to the demand for low-noise reference voltage sources, Analog Devices published an article "A 37nV / sqrtHz 2.5V reference based on dual-threshold JFET technology" in 2008, which mentioned a dual-threshold JFET tube instead of The method of generating bandgap voltage by MOS tube and triode, this dual-threshold JFET tube has a lower temperature coefficient, so it needs a smaller matching current to generate bandgap voltage, so as to achieve low noise, but this dual-threshold JFET Tubes require a special process for processing

Images