Integrating A/D convertion method and its A/D converter

Abstract

An integration type A / D converting method includes 11 ) making bidirectional integration to zero voltage V 0 and standard voltage Vb, obtaining count value T0, 12 ) making bidirectional integration to reference voltage V 1 and standard voltage Vb, obtaining count value T1, 13 ) making bidirectional integration to switching voltage Vx and standard voltage Vb, obtaining count value Tx, 14 using formulae Vx = ( V 1- 1- V 0 ) ( Tx - t 0 ) / ( t 1- 1- t 0 ) + V 0 to calculate switching voltage Vx value. Bidirectional integration in Above-mentioned steps includes following steps: 1, to proceed positive direction timing integration to 0 or V 1 or Vx, timing time being the fixed time Td when integrating circuit output voltage passing zero, 2, stopping integration when reaching integration time Td, beginning reversal integration to integrator adopting standard voltage Vb, at the same time counter beginning counting, 3, when integrator output voltage passing zero, generating triggering signal to stop counter counting, respectively obtaining count value T0, T1 or Tx corresponding to voltage V 0, V 1 or Vx. Said invention also discloses A / D converter to realize above-mentioned method.

Description

technical field [0001] The invention relates to an analog-to-digital conversion (A / D conversion) method, in particular to an integral type analog-to-digital conversion method. The invention also relates to an analog-to-digital conversion device using the method. Background technique [0002] An analog-to-digital converter (A / D converter) is used to convert an analog (voltage or current) signal to a digital signal. It is widely used in various digital processing occasions, such as in the field of instrumentation, it converts the analog signals of various sensors or transmitters on site into digital signals that can be recognized by the computer system, so as to realize the monitoring and processing of on-site signals. [0003] The current A / D conversion circuits mainly include counting A / D converters, successive comparison A / D converters, parallel A / D converters, double-integral A / D converters, etc., among which double-integral A / D conversion The converter is a kind of A / D ...

AI Technical Summary

Problems solved by technology

[0017] Aiming at the shortcomings of the dual-integral A / D conversion method in the prior art, the present invention provides an integral A / D conversion method, which aims at the defects in the prior art such as zero-point voltage and forward and reverse integration that lead to reduced conversion accuracy, Take corresponding compensation measures, so it has higher A / D conversion accuracy

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