Resistive Sensors With Selectable Thin-Film TCR Segments
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Solution Overview
Problem
Semiconductor-based resistor structures have fixed temperature coefficients of resistance (TCR) after manufacturing, limiting their application to specific purposes and increasing design and manufacturing complexity due to process variations, which affect measurement accuracy.
Innovation Solution
Incorporating a tunable resistive sensor structure with a main thin-film resistor and selectable thin-film resistors connected in series, allowing for selective activation and deactivation through control gates to adjust resistance and TCR post-manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor-based resistor structures are manufactured with fixed TCR, then manufacturing process is simple, but application flexibility is limited and measurement accuracy decreases due to process variations
Solution Approach 1:
The resistor structure is divided into a main thin-film resistor and multiple selectable thin-film resistors that can be individually activated or deactivated. This segmentation allows the TCR to be adjusted by selecting different resistor combinations, providing application flexibility while maintaining a modular structure that manages complexity.
Solution Approach 2:
The resistor structure transitions from a static, fixed TCR design to a dynamic,可调 TCR design. Control gates enable the selective activation and deactivation of thin-film resistors, allowing the TCR to be dynamically adjusted post-manufacturing to compensate for process variations and adapt to different measurement requirements.
2Measurement precision
If multiple resistor structures with different fixed TCR are manufactured, then measurement accuracy for different applications is improved, but manufacturing complexity and cost increase
Solution Approach 1:
A single resistor structure design serves multiple functions by incorporating selectable thin-film resistors that can be activated based on the measurement requirements. This universal design eliminates the need to manufacture separate resistor structures for different TCR values, reducing manufacturing complexity while maintaining measurement accuracy across various applications.
Solution Approach 2:
Instead of manufacturing multiple resistor structures with different fixed TCR parameters, the invention allows dynamic changing of the TCR parameter through control gates that selectively activate different thin-film resistors. This parameter change capability is achieved post-manufacturing, simplifying the manufacturing process while enabling accurate measurements for different applications.
3Reliability
If TCR is fixed after manufacturing, then device structure is simple, but ability to compensate for process variations is lost
Solution Approach 1:
The resistor structure incorporates control gates that enable feedback-based TCR adjustment. By monitoring measurement accuracy and process variations, the control gates can selectively activate or deactivate thin-film resistors to compensate for deviations, ensuring reliable measurements. This feedback mechanism enhances reliability while the modular structure manages the added complexity.
Solution Approach 2:
The resistor structure is designed with pre-configured selectable thin-film resistors and control gates that are prepared during manufacturing but remain inactive until needed. This preliminary action allows the structure to be ready for compensation without adding operational complexity, as the compensation capability is already in place but only activated when process variations require adjustment.
Data Source
AI summary
Some resistive sensor structures described herein include a main thin-film resistor segment and one or more selectable thin-film resistor segments that are connected in series (e.g., together and with the main thin-film resistor). The selectable thin-film resistor segment(s) of a resistive sensor structure described herein are capable of being selectively activated and/or deactivated based on the desired resistance and/or temperature coefficient of resistance (TCR) for the resistive sensor structure. Various structural implementations of control gates that may be used to selectively activate and/or deactivate one or more of the selectable thin-film resistor are disclosed herein.