ADC Overflow Detection and Correction for Biosignal Conversion
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Solution Overview
Problem
Existing analog-to-digital converter (ADC) circuits face challenges in accurately converting biosignals that exceed their input dynamic range, leading to overflow and inaccurate digital output signals.
Innovation Solution
An ADC circuit with an error detection and correction module that identifies overflow by comparing current and previous digital output signals, determining the state as normal or error, and outputs a corrected digital signal based on the original or a replacement signal, using a delta sigma (DS) ADC and voltage-controlled oscillator (VCO)-based DS ADC for precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ADC module converts analog input signals directly without range checking, then the conversion speed is maintained, but overflow errors occur when biosignals exceed the input dynamic range
Solution Approach 1:
The error detection module performs preliminary checking of the analog input signal range before the ADC conversion process. By detecting potential overflow conditions in advance and preparing replacement values beforehand, the system prevents erroneous conversions without adding significant complexity to the main ADC circuit, thus improving reliability while maintaining simplicity.
2Reliability
If the system uses overflow detection and correction mechanisms, then the accuracy of biosignal conversion is improved, but the processing time increases due to additional error checking and state determination
Solution Approach 1:
The error detection module autonomously monitors the analog input signal and automatically determines whether overflow has occurred without requiring external intervention. The correction module self-adjusts by selecting appropriate replacement values based on the detected error state, enabling the system to maintain high accuracy while minimizing processing delays through automated decision-making.
Solution Approach 2:
The system implements a feedback mechanism where the error detection module continuously monitors the relationship between current and previous digital output signals. When overflow is detected, the feedback loop triggers the correction module to apply appropriate replacement values, ensuring accurate biosignal conversion while maintaining efficient processing through continuous self-correction.
Data Source
AI summary
An analog-to-digital converter (ADC) circuit includes an ADC module configured to convert an analog input signal into an original digital output signal, an error detection module configured to detect overflow of the original digital output signal due to the analog input signal being out of an input dynamic range of the ADC module and determine a current state of the original digital output signal as a normal state or an error state, and a correction module configured to, in response to the current state of the original digital output signal being the normal state, output a corrected digital output signal based on the original digital output signal and, in response to the current state of the original digital output signal being the error state, output the corrected digital output signal based on a replacement output signal for replacing the original digital output signal.