A Bandgap Reference Voltage Source Circuit

Abstract

The invention relates to a bandgap reference voltage source circuit, which includes: a core circuit, a negative feedback loop, a current mirror structure and a starting circuit; the core circuit is used to generate a bandgap voltage, and its input end is connected to the starting circuit , the output terminal of the core circuit is connected to the current mirror structure, and the output drive capability of the voltage source circuit is increased through the current mirror structure; and between the core circuit and the startup circuit and the current mirror structure The negative feedback loop is arranged between, and the stability of the output voltage is guaranteed by the negative feedback loop. The bandgap reference voltage source of the present invention is processed by a CMOS process. The voltage source circuit can effectively increase the load capacity and reduce the temperature coefficient of the output voltage on the basis of reducing the output noise, and has low output noise, low temperature coefficient, and output The advantage of large driving capacity. The invention can be widely applied in ultra-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...

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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

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