ADC Circuit Combining Voltage Scanning and SAR Conversion
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Solution Overview
Problem
Existing analog-to-digital conversion circuits for button batteries are inefficient in accurately measuring the voltage of non-rechargeable button batteries, which maintain voltage over time, requiring more precise and efficient conversion methods.
Innovation Solution
Analog-to-digital conversion circuit combining successive approximation and initial voltage scanning procedures, utilizing a trigger controller, comparison circuit, successive approximation controller, initial voltage scanning controller, and termination controller to efficiently convert input voltage into a digital code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only successive approximation procedure is used, then conversion accuracy is improved, but conversion time increases
Solution Approach 1:
The patent applies preliminary action by performing an initial voltage scanning procedure before the successive approximation procedure. The scanning procedure quickly identifies a rough voltage range, which is then used as the starting point for the more precise but time-consuming successive approximation procedure. This preliminary scanning action reduces the overall conversion time while maintaining measurement accuracy.
Solution Approach 2:
The patent segments the voltage conversion process into two distinct phases: an initial voltage scanning procedure that quickly establishes a rough range, and a successive approximation procedure that refines the measurement. By dividing the conversion process into these segments, the system achieves both speed in the initial phase and precision in the refinement phase, resolving the contradiction between conversion time and measurement accuracy.
2Productivity
If voltage scanning procedure is used, then conversion speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent merges two different conversion procedures into a unified process: the initial voltage scanning procedure and the successive approximation procedure. The scanning procedure provides fast initial conversion, while the successive approximation procedure refines the result for high precision. By combining these two procedures in sequence, the system achieves both high conversion speed and high measurement precision, resolving the contradiction between productivity and measurement precision.
Solution Approach 2:
The patent uses feedback by taking the output of the initial voltage scanning procedure and using it as the input for the successive approximation procedure. The scanning result provides feedback information about the voltage range, which guides the successive approximation process to start from a more accurate point, thereby improving overall measurement precision while maintaining the speed advantage of the scanning procedure.
3Productivity
If multiple conversion procedures are combined, then efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the conversion circuit to perform multiple functions using the same basic components. The same comparator and counter resources are used in both the initial voltage scanning procedure and the successive approximation procedure. This multi-functionality allows the circuit to achieve high conversion efficiency through procedure combination without proportionally increasing device complexity, as the hardware is reused across different operational modes.
Data Source
AI summary
An analog-to-digital conversion circuit configured to convert an input voltage into a digital code includes a trigger controller, a comparison circuit, a successive approximation controller, and an initial voltage scanning controller. The trigger controller enables the first enable signal and the second enable signal in sequence. The comparison circuit selects a successive approximation code or a scan code to generate a conversion voltage and compares the conversion voltage with the input voltage to generate a comparison result. The successive approximation controller updates the successive approximation code based on the enabled first enable signal and the comparison result. The initial voltage scanning controller sets the initial value based on the digital code, and updates the scan code based on the enabled second enable signal and the comparison result.