Electrical Network Selection Using Fabrication Variations
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Solution Overview
Problem
Existing electronic systems face performance degradation due to component variations, and traditional trimming methods often introduce additional circuitry that fails to balance variations under all conditions and can introduce performance degradations of their own.
Innovation Solution
The approach involves forming electronic circuits using selective combinations of sub-networks of like kind and measure, allowing for the creation of networks with arbitrarily small deviations from desired performance characteristics by combining sub-networks in various topologies, such as parallel or series configurations, without the need for trim devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional trim circuitry is added to counter-balance component variations, then circuit performance is improved, but device complexity increases and additional performance degradations are introduced
Solution Approach 1:
The patent converts the harmful effect of component variations into a beneficial selection process. By fabricating multiple sub-networks with identical nominal characteristics and then selecting/combining specific ones based on their actual measured performance, the invention turns the problem of variations into a solution. The variations that would normally degrade performance are instead used to create a pool of candidates from which the optimal combination can be selected, thereby eliminating the need for additional trim circuitry.
Solution Approach 2:
The patent performs preliminary characterization and measurement of all sub-networks during fabrication before final assembly. By pre-measuring and storing the actual performance characteristics of each sub-network, the invention enables later selection and combination of optimal components without requiring real-time adjustment circuitry. This preliminary action eliminates the need for complex trim mechanisms that would otherwise be required to compensate for variations.
2Manufacturing precision
If trim circuitry is added to minimize component variations, then performance consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the original circuit into multiple identical sub-networks that can be independently fabricated and characterized. Each sub-network is designed to be topologically equivalent and nominally identical, allowing them to be manufactured using the same process. This segmentation enables parallel fabrication and independent measurement, simplifying the manufacturing process while improving performance consistency through selective combination.
Solution Approach 2:
The patent changes the approach from actively adjusting parameters using trim circuitry to passively selecting sub-networks based on their inherent parameter values. By measuring and cataloging the actual parameters of each sub-network during fabrication, the invention enables parameter-based selection and combination without requiring additional adjustment mechanisms, thereby improving manufacturing simplicity while maintaining precision.
3Measurement precision
If selective combinations of sub-networks are used to achieve desired performance, then performance precision is improved, but measurement and selection complexity increases
Solution Approach 1:
The patent creates copies of the circuit sub-networks with identical topology and nominal characteristics. By fabricating multiple copies and measuring their actual performance, the invention enables statistical selection of the best combination. The copying approach allows for parallel measurement and characterization, reducing the complexity of individual measurements while improving overall precision through ensemble selection.
Solution Approach 2:
The patent enables the sub-networks to self-characterize through automated measurement during fabrication. Each sub-network's performance parameters are automatically measured and stored, creating a database that facilitates later selection. This self-service approach reduces manual measurement complexity and enables systematic selection algorithms to identify optimal combinations without human intervention.
Data Source
AI summary
Electrical networks are formed to produce an approximation of at least one desired performance characteristic, based on the recognition that fabrication variations introduce slight differences in electronic sub-networks which were intended to be identical. These fabrication differences are turned to an advantage by providing a pool of sub-networks, and then selectively connecting particular combinations of these sub-networks to implement networks that approximate the desired performance characteristics. The sub-networks are of like kind (e.g., resistors) and have a like measure.