Sensor Arrangement Integrator Leakage Current Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High impedance sensor input stages suffer from leakage currents, particularly systematic leakage, which affect the accuracy of sensor measurements and are not effectively addressed by existing technologies.
Innovation Solution
A sensor arrangement comprising an integrator with a balancing current generator and a compensation current generator, both implemented as switched-capacitor circuits, which operate to balance and compensate sensor signals and leakage currents respectively, thereby reducing the influence of leakage on measurement outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high impedance sensor input stages are used, then measurement sensitivity is improved, but leakage current increases affecting measurement accuracy
Solution Approach 1:
The patent segments the current compensation function into two distinct generators: a balancing current generator that handles sensor signal balancing, and a compensation current generator that specifically addresses leakage current. This segmentation allows each generator to be optimized for its specific function, improving overall measurement accuracy while managing the harmful leakage current effect.
Solution Approach 2:
The patent introduces an intermediary compensation current generator that acts as a mediator between the sensor input stage and the integrator. This intermediary component generates a compensation current that counteracts the leakage current, thereby protecting the measurement accuracy without requiring changes to the high impedance sensor input stage itself.
2Reliability
If systematic leakage current is present, then measurement reliability deteriorates, but existing technologies do not effectively address this issue
Solution Approach 1:
The patent implements a feedback mechanism where the compensation current generator receives control signals based on the detected leakage current conditions. The generator adjusts its compensation current output dynamically to counteract the systematic leakage current, thereby maintaining measurement reliability under varying operating conditions.
Solution Approach 2:
The patent changes the electrical parameters at the integrator input by introducing controlled balancing and compensation currents. These parameter changes counteract the harmful effects of systematic leakage current, allowing the system to maintain reliable measurements despite the presence of leakage.
3Measurement precision
If leakage current compensation is implemented, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the balancing current generator and compensation current generator to operate within the existing sensor arrangement architecture, utilizing available circuit components and signal paths. This multi-functional approach allows leakage compensation to be integrated without requiring completely separate dedicated circuits, thereby limiting the increase in device complexity.
4Productivity
If continuous operation is maintained, then productivity is improved, but leakage current accumulation affects measurement accuracy
Solution Approach 1:
The patent enables continuous operation of the sensor arrangement by implementing ongoing leakage current compensation through the compensation current generator. Unlike methods that require periodic interruptions for calibration or reset, this system continuously counteracts leakage current effects, maintaining both productivity and measurement accuracy throughout operation.
Data Source
AI summary
A sensor arrangement comprises an integrator with an integrator input, a sensor coupled to the integrator input, a balancing current generator coupled to the integrator input and a compensation current generator coupled to the integrator input.