A/D Converter Repeated Comparison for Voltage Fluctuation Errors
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Solution Overview
Problem
Fluctuations in internal voltages within an AD converter can lead to erroneous determination of the minimum output value change in the comparator, resulting in larger conversion errors.
Innovation Solution
An AD converter with an accumulation conversion unit, an accumulation comparison determination unit, and a control unit that repeatedly compares accumulated and input voltages to determine an equivalent-state accumulation number where the comparison signal changes, reducing conversion errors by stabilizing the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single comparison is performed between input voltage and DA converter output, then the conversion speed is fast, but conversion errors increase due to voltage fluctuations
Solution Approach 1:
The patent applies periodic action by performing multiple comparison operations in sequence rather than a single comparison. The comparison determination unit repeatedly compares the accumulated voltage with the input voltage a predetermined number of times to determine the equivalent-state accumulation number, which reduces conversion errors caused by voltage fluctuations while maintaining reasonable conversion speed through structured periodic measurements.
Solution Approach 2:
The patent uses preliminary action by accumulating the DA converter output voltage multiple times before performing the final comparison determination. The accumulation unit pre-processes the voltage signal by accumulating unit voltages, and the comparison determination unit performs preliminary repeated comparisons to identify the equivalent-state accumulation number, ensuring more accurate conversion results before final data determination.
2Measurement precision
If multiple comparisons are performed to reduce conversion errors, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the accumulation function and comparison function into an integrated determination process. The accumulation unit and comparison determination unit work together as a unified system where the accumulation of voltages and the repeated comparisons are combined to determine the equivalent-state accumulation number, reducing the need for separate complex correction circuits while improving measurement precision.
Data Source
AI summary
An AD converter includes: an accumulation conversion unit that performs a comparison of magnitudes of an input voltage V2 and an accumulated voltage V1 obtained by accumulating a unit voltage and outputs a comparison signal representing a result of the comparison; an accumulation comparison determination unit that repeatedly compares an accumulated voltage V1, obtained by repeating the comparison until the comparison signal changes and corresponding to an accumulated voltage V1 at which the comparison signal changes, and the input voltage V2 a predetermined number of times to determine an equivalent-state accumulation number in which a state probability that the comparison signal changes is equal to a threshold; and a control unit that determines conversion data of the input voltage using the equivalent-state accumulation number.