High-order curvature compensation reference voltage source with modifying function

A reference voltage source and curvature compensation technology, which is applied in the field of circuits, can solve the problems of randomness, existing between chips, and the overall performance of the reference source is becoming more and more serious, so as to reduce the impact, improve accuracy, Effect of Reducing Resistor Mismatch Error

Active Publication Date: 2015-01-21
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

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  • High-order curvature compensation reference voltage source with modifying function
  • High-order curvature compensation reference voltage source with modifying function
  • High-order curvature compensation reference voltage source with modifying function

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Embodiment Construction

[0034] The following specific examples illustrate the implementation of the present invention. Those familiar with the technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0035] See Figure 1 to Figure 8 . It should be noted that the structure, ratio, size, etc. shown in the accompanying drawings in this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not intended to limit the implementation of the present invention Limited conditions, so it has no technical significance. Any structural modification, proportional relationship change or size adjustment should still fall under the present invention without affecting the effects and objectives that can be achieved by the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the term...

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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, ...

Claims

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Application Information

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IPC IPC(8): G05F1/567
Inventor 万文艳程新红吴忠昊张扬金星
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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