Automated Circuit Design Stability Constraints
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Solution Overview
Problem
Existing automated circuit design processes for electronic systems with feedback lack the ability to generate stability constraints, leading to unstable circuit designs due to complex inter-relationships and tradeoffs, often requiring trial-and-error approaches and not effectively utilizing equations-based design techniques for stable feedback system operation.
Innovation Solution
An automated design process that generates equations to define stability constraints for feedback systems, allowing problem solvers to calculate specific transistor dimensions, ensuring stable circuit operation by articulating constraints that account for under-damped, over-damped, and critically damped responses, and incorporating settling time parameters to manage ringing and decay rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If equations-based design techniques are used to automate circuit design, then design time and complexity are reduced, but stability constraints cannot be generated leading to unstable circuit operation
Solution Approach 1:
The patent applies preliminary action by pre-defining stability constraints and damping requirements before the automated design process begins. The system establishes stability criteria (such as damping ratios and settling time specifications) as input parameters, allowing the automated equations-based solver to generate stable circuit designs directly without requiring post-design stability adjustment or trial-and-error modification.
2Reliability
If trial-and-error design approaches are used to ensure stability, then circuit stability can be achieved, but design time and complexity increase significantly
Solution Approach 1:
The patent implements feedback mechanisms by incorporating stability constraints and damping ratios as controllable parameters in the automated design process. The system uses feedback from stability analysis to adjust design parameters automatically, allowing the equations-based solver to converge on stable solutions without requiring manual trial-and-error iteration. This feedback loop enables the system to achieve both stability and efficiency.
3Manufacturing precision
If detailed transistor-level equations are substituted into system-level equations, then design precision is improved, but the complexity of the equation system increases making stability analysis difficult
Solution Approach 1:
The patent applies segmentation by dividing the stability analysis into separate, manageable components. Instead of attempting to analyze the entire complex transistor-level system at once, the system segments the stability constraints into individual damping ratio requirements and settling time specifications for different circuit stages. This segmentation allows the automated solver to handle complexity systematically while maintaining precision in transistor-level design.
Data Source
AI summary
A method is described that involves accepting a description of an electronic system having feedback. The method further includes expressing a real root of the electronic system's transfer function and expressing a real part of a complex root of the electronic system's transfer function. The method further includes expressing a time parameter as a maximum of the real root and the real part of a complex root. The method further involves expressing a settling time of the electronic system with the time parameter and using the settling time to automatically generate a design for the electronic system.