Offset Correction Circuit for Accurate ADC Signal Comparison
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Solution Overview
Problem
Operational amplifiers introduce offset voltage during signal transmission, leading to inaccurate conversion of analog signals to digital signals, which affects the accuracy of memory usage.
Innovation Solution
An offset voltage correction circuit comprising a data obtaining module, a trimming enable module, and an offset correction module, which compares data and reference signals to generate an enable flag signal to cancel the offset signal, ensuring accurate signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If operational amplifier is used for signal transmission, then signal amplification and processing capability is improved, but offset voltage is introduced causing conversion accuracy to deteriorate
Solution Approach 1:
The patent applies preliminary action by performing offset voltage measurement and correction before the actual analog-to-digital conversion process. The system pre-characterizes the operational amplifier's offset voltage and uses this information to compensate for the offset during signal conversion, thereby eliminating the accuracy degradation caused by offset voltage while maintaining the amplification capability.
Solution Approach 2:
The patent implements feedback by measuring the actual output of the operational amplifier and using this measurement to generate a correction signal that is fed back to compensate for the offset voltage. This closed-loop feedback mechanism continuously monitors and corrects the offset, maintaining high conversion accuracy despite the presence of the operational amplifier's inherent offset voltage.
2Measurement precision
If offset voltage correction is implemented, then signal transmission accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent uses copying by creating a duplicate or model of the offset voltage characteristic through measurement and storage. Instead of directly correcting the complex operational amplifier output, the system creates a simplified representation of the offset voltage and uses this copy to generate the necessary correction, thereby reducing the complexity of the correction circuit while maintaining accuracy.
Solution Approach 2:
The patent applies parameter changes by measuring and storing the offset voltage as a specific parameter (digital value) and then using this parameter to adjust the conversion process. By transforming the continuous offset voltage into a discrete correctable parameter, the system simplifies the correction mechanism while achieving high accuracy in signal transmission.
Data Source
AI summary
The present disclosure provides an offset voltage correction circuit and an offset voltage correction method, including: a data obtaining module, configured to receive a data signal and a reference signal, and obtain a data indicator signal based on a comparison result of the reference signal and an offset data signal, the offset data signal being a data signal superimposed with an offset signal; a trimming enable module, configured to receive the data signal, the reference signal, the data indicator signal and an enable signal, obtain a theoretical indicator signal based on a comparison result of the data signal and the reference signal if the enable signal is of a high level, and generate an enable flag signal based on a comparison result of the theoretical indicator signal and the data indicator signal; and an offset correction module, configured to cancel the offset signal based on the enable flag signal.