Photomask White Space Validation via Secondary Circuit Insertion
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Solution Overview
Problem
Semiconductor photomasks contain white space that can lead to the possibility of unwanted additional circuit elements being added, compromising design integrity and requiring a method to validate the correct mask usage during semiconductor manufacture.
Innovation Solution
A method involving an algorithm to analyze and insert a secondary electrical design with known properties into the white space of the photomask, which can be electrically isolated or coupled to the primary design, to validate the semiconductor circuit design by matching electrical properties during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If white space is left on the photomask for potential future additions, then design flexibility is improved, but design integrity is compromised due to possibility of unwanted circuit elements being added
Solution Approach 1:
The patent applies preliminary action by inserting a secondary electrical design with known electrical properties into the white space during the mask design phase. This pre-placed design serves as a validation mechanism that will be tested later to ensure the mask was used correctly, thereby maintaining design integrity while preserving the white space for potential future legitimate additions.
Solution Approach 2:
The patent implements feedback by creating a validation mechanism where the secondary electrical design's known electrical properties are measured after manufacturing and compared against expected values. This feedback loop confirms whether the photomask was applied correctly and whether any unwanted circuit elements were added to the white space, thus maintaining design integrity.
2Reliability
If a secondary electrical design is inserted into the white space for validation, then design integrity is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrical design into two distinct parts: the primary electrical design that performs the main circuit function, and the secondary electrical design that serves solely as a validation mechanism. This segmentation allows the validation function to be added without interfering with the primary design's functionality, managing complexity through clear functional separation.
Solution Approach 2:
The secondary electrical design acts as an intermediary element between the photomask application process and the validation process. It provides a known reference that mediates the verification of mask correctness, allowing validation without directly modifying or interfering with the primary circuit design.
3Reliability
If electrical testing is performed to validate mask usage, then design integrity is ensured, but manufacturing time increases
Solution Approach 1:
The validation mechanism is prepared in advance during the mask design phase, with the secondary electrical design's expected electrical properties calculated and stored. This preliminary preparation allows for rapid validation during manufacturing, as only a simple measurement and comparison are needed, minimizing the time added to the manufacturing process.
Data Source
AI summary
An embodiment of the invention may include a method for ensuring semiconductor design integrity. The method may include analyzing a photomask design for a semiconductor circuit. The photomask may include a primary electrical design necessary for the operation of the semiconductor circuit, and white space, which has no primary electrical design. The method may include inserting a secondary electrical design into the white space of the photomask design for the semiconductor circuit. The secondary electrical design may have known electrical properties for validating the semiconductor circuit design.