Band-gap reference voltage source circuit and electronic equipment

Abstract

The invention provides a band-gap reference voltage source circuit and electronic equipment, the band-gap reference voltage source circuit comprises a starting circuit, an operation amplifier circuit and an output voltage circuit, wherein the starting circuit is used for providing reference voltage for the band-gap reference voltage source circuit to prevent the band-gap reference voltage source circuit from working in a zero state area; the operational amplifier circuit is electrically connected with the starting circuit and is used for generating working current for the output voltage circuit according to the reference voltage; and the output voltage circuit is electrically connected with the operational amplifier circuit and is used for receiving the working current and amplifying or reducing the reference voltage according to the working current in a preset proportion so as to obtain the reference voltage with the zero temperature coefficient. According to the embodiment of the invention, the reference voltage with a zero temperature coefficient can be generated, and the low-voltage starting circuit has the advantages of low-voltage starting, high power supply ripple rejection ratio and small area.

Description

technical field [0001] The present application relates to a reference voltage source circuit, in particular to a bandgap reference voltage source circuit and electronic equipment. Background technique [0002] With the continuous progress of integrated circuit technology, bandgap reference sources are more and more widely used in various electronic systems. The bandgap reference provides the reference voltage for the system, and its performance will directly affect the working performance of the entire system. Therefore, the output reference voltage is required to have a lower temperature coefficient and higher precision, that is, the circuit distribution range is relatively small, the noise is small, and the temperature coefficient is relatively small. [0003] figure 1 Shown is a self-biased bandgap voltage source circuit commonly used in power systems, in which the depletion-type NMOS transistor MD1 and NMOS transistor MN2 are connected in series, and the node between t...

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Problems solved by technology

[0004] However, this circuit also has some disadvantages. For example, since the VREF voltage is process-dependent and the VREF node is high impedance, the bandgap voltage source circuit needs to add a buffer circuit to adjust the VREF voltage to the required voltage.

In addition, adding a snubber circuit will make the low voltage and high PSRR of this bandgap voltage source circuit limited by the snubber circuit

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