ADC Temperature Correction via Residue Feedback
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Solution Overview
Problem
Existing analog-to-digital converters (ADCs) suffer from temperature-based errors due to temperature changes at the sensor during the conversion cycle, which are not adequately compensated by existing temperature compensation methods.
Innovation Solution
The system includes a first sensor for generating an electrical output, an integrating ADC with a first and second converter circuit, a combiner, and a control circuit that adjusts the operation of the second converter based on temperature feedback from a second sensor, applying temperature corrections through differentiation and integration to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation is applied using a temperature sensor to determine correction for converter output, then temperature variation compensation is improved, but temperature-based errors between integration interval and feedback application are not corrected
Solution Approach 1:
The patent applies preliminary action by performing temperature compensation at multiple stages before the final feedback application. Temperature correction values are calculated in advance based on temperature sensor readings during integration, and these corrections are pre-applied to the converter output and residue values before feedback is applied, ensuring that temperature drift is compensated before it causes feedback errors
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature during the conversion cycle and using temperature sensor readings to dynamically adjust compensation values. The temperature compensation mechanism uses feedback from temperature measurements to correct converter output in real-time, and this feedback loop ensures that compensation is continuously updated to match actual temperature conditions throughout the conversion process
2Measurement precision
If integration period is extended to reduce measurement noise, then measurement noise reduction is improved, but temperature drift during conversion cycle increases
Solution Approach 1:
The patent applies segmentation by dividing the temperature compensation process into multiple discrete stages corresponding to different phases of the conversion cycle. Temperature corrections are calculated and applied separately for the integration period, the residue conversion period, and the feedback application period. This segmented approach allows each stage to be optimized independently, reducing overall temperature-induced errors while maintaining long integration periods for noise reduction
Data Source
AI summary
Integrating ADC based sensing systems that convert the output of a measurement sensor to a digital value avoid conversion errors caused by sensor temperature variation during the conversion cycle. The systems may either include a primary integrating ADC and a residue ADC, and adjust rate of operation of the ADCs independently according to a sensed temperature of the measurement sensor, or the systems may differentiate an output of the residue ADC, and apply a temperature correction in accordance with the sensed temperature of the sensor to an output of the differentiator, integrate the temperature-corrected output of the differentiator and then combine the result with the output of the primary integrating ADC.