Trimmed Component Network Fuse Adjustment
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Solution Overview
Problem
Circuit components on chips often deviate from specifications due to process variations, requiring trimming to meet specifications, but existing methods lack efficient and precise control over component values across multiple networks.
Innovation Solution
A network of components with parallel paths and programmable switches, where fuses are selectively cut to adjust component values based on a TRIM CODE, ensuring matching adjustments across similar components, allowing for precise trimming and fine-tuned adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional separate trimming methods are used for each component network, then each component can be trimmed individually, but the chip space increases and trimming precision across multiple networks deteriorates
Solution Approach 1:
The patent merges multiple component networks into a shared network structure where multiple components are connected in parallel between common nodes. This allows a single trim code to simultaneously adjust multiple components, reducing the number of separate trim circuits needed and conserving chip space while maintaining trimming precision across all components.
Solution Approach 2:
The patent creates a universal trim code that can be applied to multiple component networks simultaneously. The same trim code adjusts multiple components across different networks, making the trimming mechanism multi-functional and eliminating the need for separate trimming circuits for each component, thereby reducing chip space requirements.
2Reliability
If process variations are not compensated, then manufacturing is simpler, but circuit performance reliability deteriorates
Solution Approach 1:
The patent implements self-service trimming where the trim code automatically compensates for process variations in each component based on its position in the shared network. The system uses the inherent relationships between parallel components to self-correct variations without requiring external calibration or complex control circuits, thus improving reliability while limiting complexity growth.
Solution Approach 2:
The patent compensates for process variations by changing the electrical parameters (resistance values) of components through selective fuse cutting in the shared network. By adjusting the resistance parameters of parallel components based on measured variations, the system maintains circuit performance reliability without adding complex active compensation circuits.
3Manufacturing precision
If more fuses are used for finer trimming control, then trimming precision improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the trim control into discrete fuse elements arranged in parallel paths within the shared network. Each fuse represents a discrete adjustment step, allowing fine control of component values through selective fuse cutting. This segmentation provides precise trimming control while keeping the structure systematic and manufacturable through standard fabrication processes.
Data Source
AI summary
A trimmable component network of switched parallel paths is described, each path contains a component, typically a resistor, with a portion of the component bypassed by fuses. The bypassed portion represents the same percentage of the component's value for each of the trimmable components in the parallel paths. A component is measured against a specification and if the specification is not met a prescribed number of fuses are cut to bring the component within its specification. A TRIM CODE may be used to identify the specific fuses to be cut, and thus the specific fuses that are to remain intact. The same TRIM CODE is applied to the components in the parallel paths.