CN107817862A - A kind of multiplier for improving band gap reference precision trims compensation technique - Google Patents

Abstract

The present invention proposes a multiplier trim compensation technology for improving the accuracy of the bandgap reference source, which belongs to the fields of microelectronics and sensing technology, and is characterized in that the multiplier trimming curve is used to match the temperature characteristic curve of the bandgap reference source. Multiply method, and rationally design the function value of the multiplier trimming curve in different temperature ranges, and adjust the curvature of the temperature characteristic curve of the bandgap reference source; the multiplier trimming curve is a function value that changes with temperature and the maximum For the curve with a value of 1, the function value of the multiplier trimming curve is larger in the temperature range where the temperature drift of the bandgap reference source is small, and the function value of the multiplier trimming curve is larger in the temperature range where the temperature drift of the bandgap reference source is larger. The value is small; the advantage of the present invention is that it is easy to implement, simple and universal, and greatly improves the overall accuracy of the bandgap reference source, ensuring the stability of the high-precision circuit system; the multiplier trim compensation technology proposed by the present invention is suitable for improving Accuracy of various bandgap reference sources.

Description

A Multiplier Trimming Compensation Technology for Improving the Accuracy of Bandgap Reference Source

technical field

The invention proposes a multiplier trimming and compensation technology for improving the accuracy of a bandgap reference source, which belongs to the fields of microelectronics and sensing technology.

Background technique

The bandgap reference source is used as the power supply and reference voltage of the precision circuit system, and its accuracy plays an important role in the stability of the system; in order to improve the accuracy of the bandgap reference source, people have proposed a variety of curves for the temperature characteristic curve of the bandgap reference source However, these technologies are basically implemented based on addition and subtraction, that is, using the original bandgap reference source temperature characteristic curve to add and subtract the curvature compensation curve used to achieve curvature compensation. This type of curvature compensation based on addition and subtraction On the one hand, the degree of accuracy improvement is not high enough, on the other hand, it is often necessary to add circuits to achieve compensation, resulting in increased circuit complexity, chip area, cost, and power consumption.

Contents of the invention

The purpose of the present invention is to propose a simple and efficient multiplier trimming and compensation technology for improving the accuracy of the bandgap reference source. This technology improves the temperature characteristic curve in the temperature range with small temperature drift of the bandgap reference source by means of multiplication, and is extremely efficient. Greatly improve the temperature characteristic curve of the bandgap reference source in the temperature range with large temperature drift, thereby simply and efficiently improving the accuracy of the bandgap reference source in the overall temperature range, so as to overcome the shortcomings of the prior art.

In order to achieve the above-mentioned purpose, the present invention proposes a multiplier trimming and compensation technology for improving the accuracy of the bandgap reference source, and adopts the method of multiplying the multiplier trimming curve with the temperature characteristic curve of the bandgap reference source. In this invention, the multiplier trimming The adjustment curve is used as the multiplication coefficient of the temperature curve of the bandgap reference source, and its function value in different temperature ranges is reasonably designed to adjust the curvature of the temperature characteristic curve of the bandgap reference source to obtain the adjusted band with high precision simply and efficiently. The temperature characteristic curve of the gap reference source.

The multiplier trimming curve is a curve whose function value changes with temperature and has a maximum value of 1. In the temperature range where the temperature drift of the bandgap reference source is small, the function value of the multiplier trimming curve is relatively large. In the temperature range where the temperature drift of the reference source is large, the function value of the multiplier trimming curve is small.

The multiplier trimming compensation technology for improving the accuracy of the bandgap reference source uses the multiplier trimming curve to multiply the temperature characteristic curve of the bandgap reference source. When the function value of the multiplier trimming curve is close to 1, It can improve the temperature characteristic curve in the temperature range with small temperature drift of the bandgap reference source. When the function value of the multiplier trimming curve is small, it can greatly improve the temperature characteristic curve in the temperature range with large temperature drift of the bandgap reference source , thus greatly improving the accuracy of the bandgap reference source.

The temperature characteristic curve of the bandgap reference source is the curve of the reference source changing with temperature produced by various bandgap reference circuits. It is classified from its shape, mainly including a parabolic curve with a lower opening, a parabolic curve with an upper opening and sinusoidal like.

The invention has the advantages of being simple and efficient, easy to implement, and flexible and universal; it can greatly improve the accuracy of the bandgap reference source; it can be realized without increasing the complexity of the circuit, reducing the chip area, saving costs, and reducing power consumption.

Description of drawings

Fig. 1 is the schematic diagram of a kind of multiplier trim compensation technology that improves the precision of bandgap reference source that the present invention proposes;

Fig. 2 is the schematic diagram of multiplier trimming when the present invention is trimming the bandgap reference source with the lower opening parabolic temperature characteristic curve;

Fig. 3 is a multiplier trimming schematic diagram of the present invention when trimming a bandgap reference source with an upper-opening parabolic temperature characteristic curve.

Detailed ways

Below in conjunction with accompanying drawing and embodiment;

Please refer to Fig. 1, which is a schematic diagram of a multiplier trimming compensation technology for improving the accuracy of the bandgap reference source proposed by the present invention; a multiplier trimming compensation technology for improving the accuracy of the bandgap reference source proposed by the present invention, Adopt the method of multiplying the multiplier trimming curve and the bandgap reference source temperature characteristic curve, the multiplier trimming curve is used as the multiplication coefficient of the bandgap reference source temperature curve in the present invention, rationally design its function value in different temperature intervals, Curvature trimming is performed on the temperature characteristic curve of the bandgap reference source to obtain the temperature characteristic curve of the trimmed bandgap reference source with high precision.

The temperature characteristic curve of the bandgap reference source is the curve of the reference source changing with temperature produced by various bandgap reference circuits. It is classified from its shape, mainly including a parabolic curve with a lower opening, a parabolic curve with an upper opening and sinusoidal like.

The multiplier trimming curve is a curve whose function value changes with temperature and has a maximum value of 1. In the temperature range where the temperature drift of the bandgap reference source is small, the function value of the multiplier trimming curve is relatively large. In the temperature range where the temperature drift of the reference source is large, the function value of the multiplier trimming curve is small.

The multiplier trimming compensation technology uses the multiplier trimming curve to multiply the temperature characteristic curve of the bandgap reference source. When the function value of the multiplier trimming curve is close to 1, the temperature of the bandgap reference source can be improved. The temperature characteristic curve in the temperature range with small drift, when the function value of the multiplier trimming curve is small, the temperature characteristic curve in the temperature range with large temperature drift of the bandgap reference source can be greatly improved, thereby greatly improving the bandgap The precision of the reference source.

Please refer to FIG. 2 , which is a schematic diagram of trimming when trimming a bandgap reference source with a lower opening temperature characteristic curve according to the present invention, and its multiplier trimming compensation principle is the same as that in FIG. 1 .

Please refer to FIG. 3 , which is a schematic diagram of trimming when trimming a bandgap reference source with an upper opening temperature characteristic curve according to the present invention, and its multiplier trimming compensation principle is the same as that in FIG. 1 .

The above-mentioned contents are only preferred embodiments of the present invention, and cannot be considered as limiting the implementation scope of the present invention; all equal changes and improvements made according to the scope of application of the present invention should still belong to the scope of the patent of the present invention. within range.

Claims (4)

1. a kind of multiplier for improving band gap reference precision trims compensation technique, it is characterised in that trims curve and band using multiplier The method that gap a reference source temperature characteristics is multiplied, multiplier trims curve multiplying as band gap reference temperature curve in the invention Method coefficient, its functional value in different temperatures section is rationally designed, curvature is carried out to the temperature characteristics of band gap reference Trim, obtain the high temperature characteristics for trimming rear band gap reference of precision.

2. the multiplier of band gap reference as claimed in claim 1 trims compensation technique, it is characterised in that the multiplier of use trims Curve is the curve that a kind of functional value varies with temperature and maximum is 1, in the less temperature range of band gap reference temperature drift, is multiplied The functional value that number trims curve is larger, in the temperature range that band gap reference temperature drift is larger, multiplier trim the functional value of curve compared with It is small.

3. the multiplier of band gap reference as claimed in claim 1 trims compensation technique, it is characterised in that when multiplier trims curve Functional value close to 1 when, the temperature characteristics in the less temperature range of band gap reference temperature drift can be improved, when multiplier trims When the functional value of curve is smaller, it can greatly improve the temperature characteristics in the big temperature range of band gap reference temperature drift, so as to The overall precision of band gap reference is greatly improved.

4. the multiplier of band gap reference as claimed in claim 1 trims compensation technique, it is characterised in that various suitable for trimming The temperature characteristics of band gap reference, i.e., the song varied with temperature suitable for a reference value caused by various band-gap reference circuits Line, mainly there are the class parabolic curve of under shed, the class parabolic curve and class sine curve of upper shed from its Shape Classification.