Capacitance Detection Circuit for Crosstalk-Isolated Array Sensing
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Solution Overview
Problem
Existing capacitance detection methods in capacitor arrays suffer from inaccurate results due to crosstalk, where the capacitance of surrounding capacitor elements interferes with the measurement of the target capacitor element.
Innovation Solution
A capacitance detection circuit and method that detects the capacitance of a capacitor element by measuring the first, second, and third capacitances of specific capacitor sets, including the target capacitor element and its row and column counterparts, to accurately isolate and calculate the target capacitor's capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional capacitance detection is used on capacitor array elements, then detection coverage is achieved, but measurement precision deteriorates due to crosstalk from surrounding capacitor elements
Solution Approach 1:
The patent segments the capacitance measurement process into three distinct measurement stages: (1) measuring the target capacitor element's capacitance, (2) measuring the row capacitor element's capacitance, and (3) measuring the column capacitor element's capacitance. By separating these measurements and using switching circuits to isolate different capacitor groups, the patent eliminates crosstalk interference between surrounding capacitors while maintaining comprehensive detection coverage.
2Measurement precision
If capacitance detection is performed on individual capacitor elements, then detection resolution is improved, but device complexity increases due to additional switching and measurement circuits
Solution Approach 1:
The patent employs a universal capacitance detection circuit that can measure different capacitor elements (target, row, and column capacitors) through a single integrated system. The switching circuit dynamically reconfigures the measurement path to accommodate different measurement objectives, eliminating the need for separate dedicated measurement circuits for each capacitor type and reducing overall system complexity.
Solution Approach 2:
The patent implements periodic measurement cycles where the capacitance detection circuit sequentially measures the target capacitor element, then the row capacitor element, and finally the column capacitor element. This periodic action allows the system to use the same hardware resources for multiple measurement purposes, reducing circuit complexity while maintaining high measurement precision through time-separated measurements.
Data Source
AI summary
This application provides a capacitance detection circuit for detecting capacitance of a capacitor element within a capacitor array. The circuit includes a capacitance detection module for detecting a first capacitance of a first capacitor set, a second capacitance of a second capacitor set, and a third capacitance of the third capacitor set, the first capacitor set comprising the capacitor element and a row capacitor element in the same row of the capacitor array as the capacitor element, the second capacitor set comprising the capacitor element and a column capacitor element in the same column of the capacitor array as the capacitor element, the third capacitor set comprising the row capacitor element and the column capacitor element; and a processing module, configured to obtain the capacitance of the capacitor element according to the first capacitance, the second capacitance and the third capacitance.