A Correction Method of Differential AD Converter Circuit with Single-End Input
A converter circuit, single-ended input technology, applied in the fields of computer and electronic technology, can solve the problems of unfavorable mass production, difficult engineering, high precision and consistency requirements, etc., to achieve low implementation cost, improve conversion accuracy, and increase a small amount of effect of the program
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[0037] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0038] The present invention proposes a correction algorithm for calculating the sampling voltage value, introduces the resistance values of the input resistance R1 and the feedback resistance Rf in the single-ended input differential output circuit as variables, improves the conventional algorithm for calculating the sampling voltage value, and improves the data The sampling accuracy of the acquisition system. The correction algorithm is represented in block diagram form as image 3 shown.
[0039] First of all, due to the deviation between the resistance value of the input resistor R1 and the resistance value of the feedback resistor Rf in the single-ended input differential output conversion circuit, the cancellation process cannot be performed, then the input conversion voltage of the differential A / D converter is formula (3), so the difference can be obta...
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