Analog Standard Cell Layouts Aligned With Digital Design Rules
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Solution Overview
Problem
Analog/mixed-signal circuit design lacks optimized layouts, making it less efficient compared to digital circuit design, and there is a need for standard cells that can adhere to digital layout rules to enable cell-based design methodologies for both digital and analog/mixed-signal circuits.
Innovation Solution
Generating analog and mixed-signal standard cell libraries that do not violate digital standard cell layout rules, by creating target standard cells through modifying digital standard cells or laying passive components above/below them, allowing for integrated circuit design that combines digital, analog, and mixed-signal cells without violating layout rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If analog/mixed-signal circuits are designed at the transistor level without optimized layouts, then design flexibility is improved, but area and power dissipation increase
Solution Approach 1:
The patent applies parameter changes by modifying layout parameters of analog/mixed-signal standard cells to satisfy digital layout rules. Specifically, it adjusts cell dimensions, transistor positioning, and interconnect routing to meet digital design rules while preserving analog functionality, thereby reducing area without sacrificing design flexibility
Solution Approach 2:
The patent creates universal standard cells that can function in both analog/mixed-signal and digital contexts. By designing analog standard cells that comply with digital layout rules, the same cell library can be used across different circuit types, enabling area optimization through standardized designs while maintaining the flexibility needed for analog applications
2Adaptability or versatility
If analog/mixed-signal circuits are designed at the transistor level without optimized layouts, then design flexibility is improved, but power dissipation increases
Solution Approach 1:
The patent modifies layout parameters including transistor sizing, spacing, and interconnect routing to optimize power efficiency. By adjusting these parameters to match digital standard cell conventions, the design reduces leakage and dynamic power consumption while maintaining analog performance and design flexibility
Solution Approach 2:
The standardized analog/mixed-signal cells are designed to automatically comply with digital layout rules, enabling them to self-optimize power consumption through proven digital cell architectures without requiring separate optimization processes
3Manufacturing precision
If analog standard cells are created to comply with digital layout rules, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the cell design process into modular components that can be independently configured. By dividing analog functions into standardized blocks that comply with digital rules, the complexity is managed through systematic decomposition rather than monolithic design, making compliance achievable without overwhelming complexity
Solution Approach 2:
The patent systematically adjusts geometric and electrical parameters of analog cells to meet digital layout constraints. Through controlled parameter modification rather than fundamental redesign, compliance with manufacturing rules is achieved while minimizing increases in structural complexity
4Productivity
If digital standard cell layout optimization is applied to analog/mixed-signal cells, then productivity is improved, but layout rule compliance may be violated
Solution Approach 1:
Instead of forcing analog cells to adapt to digital rules, the patent inverts the approach by designing analog cells from the ground up to inherently satisfy digital layout constraints. This reversal ensures compliance is built-in rather than added, maintaining high productivity through standardized cells without violating manufacturing rules
Solution Approach 2:
The patent modifies key layout parameters such as cell height, transistor finger counts, and interconnect pitch to align with digital standard cell conventions. These parameter adjustments enable analog/mixed-signal cells to achieve digital-level design efficiency and automation compatibility while maintaining analog functionality
Data Source
AI summary
A method for designing an integrated circuit layout includes: generating an analog standard cell library and designing the integrated circuit layout by using at least the analog standard cell library, where the step of generating the analog standard cell library includes creating a target analog standard cell that is included in the analog standard cell library and does not violate layout rules of digital standard cells. Another method for designing an integrated circuit layout includes: generating a mixed-signal standard cell library and designing the integrated circuit layout by using at least the mixed-signal standard cell library, where the step of generating the mixed-signal standard cell library includes creating a target mixed-signal standard cell that is included in the mixed-signal standard cell library and does not violate layout rules of digital standard cells.