Adaptive Gain and Offset Control for High-Speed A/D Conversion
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Solution Overview
Problem
Existing A/D converters with high resolution require a long time for conversion, limiting the ability to convert analog signals into digital signals within a desired time frame.
Innovation Solution
A circuit device comprising a gain adjustment circuit, offset adjustment circuit, and A/D converter, controlled by a microcomputer, dynamically adjusts gain and offset voltage based on previous digital signal conversions to enhance conversion speed and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution A/D conversion is implemented, then measurement precision is improved, but conversion time increases causing loss of time
Solution Approach 1:
The patent implements dynamic gain adjustment where the gain of the amplifier circuit is automatically changed based on the magnitude of the input signal. When the signal is small, higher gain is applied to improve resolution; when the signal is large, lower gain is used to prevent saturation and enable faster conversion. This dynamic adaptation resolves the contradiction by making the conversion characteristics variable rather than fixed.
Solution Approach 2:
The patent changes the gain parameter of the amplifier circuit based on signal conditions and previous conversion results. By adjusting the gain parameter dynamically, the system can optimize between resolution and speed for different input scenarios, directly addressing the trade-off between measurement precision and conversion time.
2Measurement precision
If high resolution A/D conversion is implemented, then measurement precision is improved, but productivity decreases due to slower conversion speed
Solution Approach 1:
The system dynamically adjusts the gain based on signal magnitude and conversion history, enabling high resolution for small signals while maintaining high throughput for large signals. This dynamic behavior allows the system to adapt its resolution-speed trade-off in real-time, improving overall productivity without sacrificing precision when needed.
Solution Approach 2:
The patent uses feedback from previous A/D conversion results to adjust the gain for subsequent conversions. By analyzing the magnitude and characteristics of previously converted signals, the system optimizes the gain setting to balance resolution requirements with conversion speed, thereby improving productivity while maintaining measurement precision.
3Device complexity
If fixed gain amplification is used, then device complexity is reduced, but adaptability decreases for signals of varying magnitude
Solution Approach 1:
The patent introduces dynamic gain adjustment that automatically adapts to different signal magnitudes. The gain is changed based on the input signal level and previous conversion results, enabling the simple amplifier circuit to handle a wide range of signal magnitudes effectively, thus improving adaptability without significantly increasing complexity.
Solution Approach 2:
The gain parameter of the amplifier is changed dynamically based on signal conditions. This parameter adjustment allows the fixed-structure amplifier circuit to adapt to varying signal magnitudes, achieving versatility in handling different signal ranges while maintaining relatively simple device architecture.
Data Source
AI summary
Provided is a circuit device that can achieve A/D conversion at a high speed and a high resolution. This circuit device comprises: a gain adjustment circuit that adjusts the gain of an analog output signal outputted from a sensor; an offset adjustment circuit that adjusts the offset voltage of the analog output signal; an A/D converter that converts the analog output signal to a digital signal; and a control unit that sets the gain and the offset voltage of the analog output signal on the basis of the voltage value of a digital signal that was immediately previously converted by the A/D converter.