Bandgap reference circuit with a high power supply rejection ratio and high order curvature compensation

Abstract

The invention provides a bandgap reference circuit with a high power supply rejection ratio and high order curvature compensation. The bandgap reference circuit comprises a starting circuit, a forward-acting regulator circuit, a bandgap circuit, a low temperature area piecewise linear temperature compensation circuit, a temperature compensation circuit with a high temperature area and the absolute temperature T1.5 in direct proportion and a high temperature area piecewise linear temperature compensation circuit. A low temperature area piecewise linear temperature compensation current and a temperature compensation current with the high temperature area and the absolute temperature T1.5 in direct proportion are added in a traditional bandgap reference circuit, a high temperature area piecewise linear temperature compensation current is drawn out of the traditional bandgap reference circuit, and accordingly the reference circuit with the high order curvature compensation is obtained; a negative feedback forward-acting regulator technology is added into reference voltage with high order curvature compensation, and accordingly the bandgap reference circuit with the high power supply rejection ratio and the high order curvature compensation is obtained.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a bandgap reference circuit with high power supply rejection ratio and high-order curvature compensation. Background technique [0002] With the development of integrated circuits, more and more functional modules are integrated on the same chip. As an essential part of the integrated circuit chip, the reference reference provides a stable reference voltage or current for the entire integrated circuit chip. Its temperature coefficient (TC, Temperature Coefficient) and power supply rejection ratio (PSRR, Power Supply Rejection Ratio) are largely Determine the pros and cons of the performance of the entire integrated circuit chip system. Therefore, a high precision reference circuit requires the output voltage to have low temperature coefficient and high power supply rejection ratio. [0003] The bandgap reference voltage source is widely used due to its advantages of go...

AI Technical Summary

Problems solved by technology

[0004] Due to the temperature nonlinearity of the emitter-base voltage of the PNP transistor, the first-order bandgap reference voltage has a high temperature coefficient, figure 1 The operating power supply voltage of the bandgap reference circuit shown is the external power supply VDD, so that the output bandgap reference voltage has a low power supply rejection ratio, thus restricting the application of the first-order bandgap reference circuit in high-precision systems

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