Method for correcting single-ended input differential AD converter circuit
A converter circuit, single-ended input technology, applied in the fields of electronic technology and computer, can solve the problems of difficult realization of engineering, high precision and consistency requirements, unfavorable mass production, etc., to improve conversion accuracy, realize low cost and precision Effect of Consistency Guarantee
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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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