Amplifier-ADC Scale Matching for Higher Conversion Accuracy
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Solution Overview
Problem
Existing signal-processing circuits face challenges in improving analog-to-digital conversion accuracy without increasing the bit number of the analog-to-digital converter, which leads to higher costs and larger circuit areas.
Innovation Solution
A signal-processing circuit comprising an amplification module and an analog-to-digital conversion module, where the amplification module amplifies input and reference signals with opposite sign coefficients, allowing the voltage range of the amplified signal to be adjusted to match the scale of the analog-to-digital conversion module, thereby improving accuracy and potentially reducing the bit number of the converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bit number of the analog-to-digital converter is increased to improve conversion accuracy, then the conversion accuracy is improved, but the cost and circuit area increase
Solution Approach 1:
The patent changes the parameters of the input signal by amplifying it before conversion. By adjusting the amplification factor, the small input signal is transformed into a larger signal that can be accurately converted by a low-bit analog-to-digital converter, thereby achieving high conversion accuracy without increasing the bit number
Solution Approach 2:
The patent introduces an amplifier as an intermediary component between the input signal and the analog-to-digital converter. This intermediary amplifies the input signal to match the optimal input range of the converter, enabling accurate conversion with a simplified low-bit converter structure
Data Source
AI summary
The present invention provides a signal-processing circuit including an amplification module and an analog-to-digital conversion module, wherein the amplification module includes a first input terminal for receiving an input signal, a second input terminal for receiving a reference signal, and an output terminal coupled to the analog-to-digital conversion module. Furthermore, the input signal and the reference signal are amplified by the amplification module individually, and an amplified signal is output to the analog-to-digital conversion module through the output terminal, and then the amplified signal undergoes analog-to-digital conversion by the analog-to-digital conversion module. The first amplification coefficient of which the input signal is amplified by the amplification module and the second amplification coefficient of which the reference signal is amplified by the amplification module are opposite in sign. The voltage range of the amplified signal is substantially equal to the scale of the analog-to-digital conversion module.