Wide Input Bandgap Voltage Reference with Curvature Compensation

Abstract

The invention discloses a band-gap reference voltage source with wide input belt point curvature compensation, and the band-gap reference voltage source is mainly used for solving the problems of low source rejection ratio and low temperature stability. The band-gap reference voltage source comprises a pre-bias circuit (1), a positive and negative temperature coefficient current generation circuit (3), a voltage / current conversion circuit (4) and a reference voltage generation circuit (5). The output voltage VBIAS of the pre-bias circuit (1) is output to the positive and negative temperature coefficient current generation circuit (3), the voltage / current conversion circuit (4) and the reference voltage generation circuit (5) respectively; the current IBIAS generated by the pre-bias circuit (1) is output to the positive and negative temperature coefficient current generation circuit (3); currents I1 and I2 generated by the positive and negative temperature coefficient current generation circuit (3) are output to the reference voltage generation circuit (5); and simultaneously, the voltage VBE generated by the positive and negative temperature coefficient current generation circuit (3) is converted into a current I3 by the voltage / current conversion circuit (4) and is output to the reference voltage generation circuit (5); and the reference voltage generation circuit (5) outputsthe reference voltage VREF. The band-gap reference voltage source is high in rejection ratio and excellent in temperature stability and can be applied to an integrated circuit with wide input and high precision.

Description

technical field [0001] The invention belongs to the field of microelectronics and relates to a voltage reference circuit of an integrated circuit, in particular to a bandgap reference voltage source with wide input band curvature temperature compensation. Background technique [0002] The reference voltage source is an indispensable unit in many analog circuits and digital-analog hybrid integrated circuits. The normal operation and stable performance of the circuit system are inseparable from the stable reference voltage independent of temperature and power supply changes. With the increase of the complexity of the circuit system and the enhancement of the chip function, the requirements for some performance indicators of the reference voltage source are also increased. In some integrated circuit chips, it is often required to change the input power supply voltage range from a few volts to tens of volts, such as power MOSFETs that convert direct current to alternating curren...

AI Technical Summary

Problems solved by technology

On the one hand, due to the limitation of technology and circuit structure, the input range of traditional bandgap reference voltage source is usually narrow

On the other hand, since the change of ΔVBE with temperature is linear and the change of VBE with temperature is nonlinear, there is an error in the traditional first-order temperature compensation

In 2008, Chinese patent application 200810231711.4 proposed a "wide-input CMOS bandgap reference circuit structure". The power supply rejection of the bias current mirror is relatively poor, and the noise on the power supply will affect the reference output voltage

At the same time, compared with low-voltage MOS tubes, in order to meet the requirements of high withstand voltage, this high-voltage MOS tube not only has a more complicated process, but also has poor output reference voltage accuracy.

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