High precision analogue/digital converting method and circuit

A digital conversion, digital converter technology, applied in the direction of analog-to-digital converters, etc., can solve problems such as slow speed and inability to meet

Inactive Publication Date: 2007-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ∑-△

Method used

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  • High precision analogue/digital converting method and circuit

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] As shown in Figure 1, the integrator 101 combines the signal under test, the output signal of the n-bit digital / analog converter 102 with the sawtooth wave, triangular wave or other pseudo-random high-frequency disturbance signal generation circuit 105 output sawtooth wave, triangular wave or Other pseudo-random high-frequency disturbance signals are added and output to the n-bit analog / digital converter 103. After the n-bit analog / digital converter 103 converts the signal into a digital signal, it can be processed by the microprocessor 104 (down-sampling filter) Get a high-precision digital signal.

[0025] The integrator 101 can be formed by a common operational amplifier, such as LM347. The n-bit analog / digital converter 103 can be MAX197, AD6547, AD7678 and so on. The microcontroller 108 adopts devices such as 89C52, and may also adopt AD...

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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...

Claims

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Application Information

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IPC IPC(8): H03M1/20
Inventor 林凌李刚
Owner TIANJIN UNIV
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