A vernier type high-precision high-speed a/d conversion device

Abstract

The present invention relates to a cursor-type high-accuracy and high-speed A / D conversion apparatus. The conversion apparatus in the present invention comprises m conversion units, wherein each conversion unit is used for A / D conversion of a section of consecutive digits; and further comprises: m-1 rounding up switching groups, wherein an input end of each of the rounding up switching groups is connected to the conversion unit of a corresponding digit section, so as to output a minimum voltage value, which is output by a voltage dividing circuit, greater than a voltage to be measured in the conversion unit of the corresponding digit section; m-2 rounding down switching groups, wherein an input end of each of the rounding down switching groups is connected to the conversion unit of the corresponding digit section, so as to output a maximum voltage value, which is output by the voltage dividing circuit, smaller than the voltage to be measured in the conversion unit of the corresponding digit section; and a data latch, wherein input ends of same are successively connected to digital signals output by the m conversion units according to digit sections from high to low, so as to realize synchronous output of digital signals. By means of using cursors with different accuracies to continuously carry out refined measurement on a voltage to be converted, the accuracy of analog-digital conversion is guaranteed, and the conversion speed is improved at the same time.

Description

technical field [0001] The invention relates to the technical field of high-precision and high-speed A / D conversion, in particular to a vernier type high-precision and high-speed A / D conversion device. Background technique [0002] The conversion of analog signals into digital signals (analog-to-digital conversion) is an important interface between all real systems and information systems, and it is the only channel for information systems to perceive real systems. Therefore, analog-to-digital conversion technology is one of the basic technologies of modern control, communication, information and other industries, and has very important fundamental significance. [0003] There are mainly four kinds of analog-to-digital conversion technologies at present: parallel conversion method, bit-by-bit comparison method, double integral method, and voltage-frequency conversion method. The parallel comparison method is to use a resistor network to divide the reference voltage equally,...

AI Technical Summary

Problems solved by technology

Multi-bit pipeline analog-to-digital conversion has theoretically high-precision and high-speed performance, but due to the need to perform analog subtraction and signal amplification step by step during the conversion process, the errors generated during the analog operation and amplification process will continue. In the high-precision analog-to-digital conversion, the system error can easily cover up the measurement accuracy, so it is difficult to achieve high-precision conversion in the industry for multi-bit pipeline analog-to-digital conversion

[0005] Through the analysis of the existing analog-to-digital conversion technology, it is found that the conversion accuracy and speed of analog-to-digital conversion cannot be achieved at the same time. As for unaffordable in practical industrial applications

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