High precision analogue/digital converting method and circuit

Abstract

The method includes following steps: adding signal to be measured to a sawtooth wave, triangular wave or other pseudo-random disturbing signal in high frequency, and integrating the added result; carrying out sampling in high speed within cycle of sawtooth wave, triangular wave or other pseudo-random disturbing signal; then, carrying out down sampling so as to obtain digital signal in high precision. Detection precision of the invention is much higher than resolution of A / D converter.

Description

technical field [0001] The invention relates to an electronic circuit, in particular to a high-precision analog / digital conversion method and circuit. Background technique [0002] High-precision data acquisition plays an extremely important role in various industrial measurement and control systems, instrumentation and scientific research. There are many people who have studied various data acquisition systems: for example, invention patents designed by Wang Lixin (a high-speed and large-capacity data acquisition system based on CPLD and SDRAM, application number CN200410043813.5) and invention patents designed by Wang Guyin (multiple channel high-speed data acquisition device, application number CN89106196.7), etc., but the above-mentioned design can only obtain the precision of the analog / digital converter (Analog Digital Convertor, ADC) adopted in the design. [0003] Although the existing ∑-△ type analog / digital converter has high precision, up to 24 bits, but its spee...

AI Technical Summary

Problems solved by technology

[0003] Although the existing ∑-△ type analog / digital converter has high precision, up to 24 bits, but its speed is slow and cannot meet the requirements of high speed occasions

The ∑-△ type analog / digital converter cannot achieve high speed while ensuring high precision. The reason is that only one-bit analog / digital converter and digital / analog converter are used.

Images