Vernier type high-precision and high-speed A/D conversion device

Abstract

The invention relates to a vernier type high-precision and high-speed A/D conversion device. The vernier type high-precision and high-speed A/D conversion device comprises m conversion units, each conversion unit is used for A/D conversion of a segment of continuous number of bits, and the vernier type high-precision and high-speed A/D conversion device further comprises m-1 rounding-up switch groups, wherein the input end of each rounding-up switch group is connected with the conversion unit of the corresponding bit segment and is used for outputting a minimum voltage value outputted by a voltage dividing circuit and greater than a measured voltage in the conversion unit of the corresponding bit segment; m-2 rounding-down switch groups, wherein the input end of each rounding-down switch group is connected with the conversion unit of the corresponding bit segment and is used for outputting a maximum voltage value outputted by the voltage dividing circuit and smaller than the measured voltage in the conversion unit of the corresponding bit segment; and a data latch, wherein the input end is connected with digital signals output by the m conversion units in sequence according to thebit segments from high to low and is used for synchronously outputting the digital signals. Continuous refinement measurement is performed on the to-be-converted voltage by using verniers with different precision to improve the conversion speed while ensuring the analog-to-digital conversion precision.

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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