A Bandgap Reference Voltage Source with Exponential Compensation

Abstract

The invention belongs to the technical field of electronic circuits, and in particular relates to a bandgap reference voltage source with exponential compensation characteristics. The main technical solution of the present invention provides a simple and efficient exponential compensation method. The current of the first resistor is PTAT current, so the voltage drop on the first resistor will increase as the temperature rises. The current of the sixth and seventh triodes increases with the increase of temperature, so that the current of the second resistor also increases with the increase of temperature, and the current of the low second resistor is the current of the first resistor and the current of the sixth resistor. , the sum of the currents of the seven triodes, which is equivalent to the increase of the resistance value of the second resistor as the temperature rises, that is, the high-order term of VBE is compensated by this compensation method, and this compensation method only uses two One resistor, it is more convenient to adjust the resistance value, you can get a bandgap reference voltage that is more suitable for your own use, the structure is simple, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a bandgap reference voltage source with exponential compensation characteristics. Background technique [0002] High-precision voltage sources are widely used in integrated circuits, and are an indispensable part of most analog and hybrid circuits, such as analog-to-digital converters (ADC), switching power supply technology (DC-DC), low-dropout linear regulators device (LDO). In these circuits, the voltage source is used as the reference of the comparator, and its precision directly affects the precision and performance of the whole circuit. [0003] Among many circuits that generate reference voltages, the bandgap reference has the advantages of small temperature coefficient, high power supply rejection ratio, high precision, and compatibility with CMOS technology. Adding an output voltage with a small temperature coefficient. Traditional bandgap refe...

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Problems solved by technology

[0010] Although the voltage sources of the secondary or high-order compensation structure proposed at present can achieve certain effects, these structures are usually obtained by adding a lot of resistors, transistors and other components to the traditional bandgap reference circuit. figure 1 The basic framework shown is changed to achieve, so there are problems of complex circuit structure and high cost

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