High-order curvature compensation reference voltage source with modifying function

Abstract

The invention provides a high-order curvature compensation reference voltage source with the modifying function. The high-order curvature compensation reference voltage source at least comprises a first current generating circuit, a first resistance circuit, a curvature compensation circuit and a second resistance circuit, the first current generating circuit is used for generating a one-order compensation current based on a transistor and a resistor, the first resistance circuit comprises a first adjustable resistance network and is connected with the first current generating circuit in series so as to produce a reference voltage, the curvature compensation circuit is used for generating a high-order compensation current to the first resistance circuit so that curvature compensation can be achieved, and the second resistance circuit comprises a second adjustable resistance network and is used for dividing the reference voltage so that the reference voltage can be output. The temperature characteristic curve of a voltage reference source can have a plurality of extreme values in the whole working temperature range, and the precision of the voltage reference source is obviously improved.

Description

Technical field [0001] The invention relates to the field of circuits, in particular to a high-order curvature compensation reference voltage source with trimming. Background technique [0002] The reference voltage source is a key module for analog and hybrid integrated circuit design, and the accuracy of the reference voltage source will directly determine the performance of the entire chip. The performance of certain chips or systems usually depends on the accuracy of the internal reference voltage source. The minimum temperature coefficient of the traditional bandgap reference source is about 10ppm / °C in the range of -40℃~125℃ after l-order compensation, which cannot meet the requirements of high-precision system, and the temperature coefficient of the bandgap voltage reference source must be further reduced. [0003] For example, a Chinese patent document with application number 201110120544.8 discloses a bandgap voltage reference source with variable curvature compensation, ...

AI Technical Summary

Problems solved by technology

[0005] Although there are a large number of high-order temperature compensation techniques, the integrated reference source is always affected by the non-ideal factors of the semiconductor manufacturing process, and some of the errors are systematic, such as temperature coefficient and channel length modulation effects, etc., which can be simulated by simulation software Carry out effective simulation and prediction; non-ideal factors such as device mismatch and absolute value deviation are random and exist between chips; these errors have an increasingly serious impact on the overall performance of the reference source, so they all need to be manufactured After the process to adjust (ie trimming)

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