Transient Stability Analysis in Integrated Circuit Simulation
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Solution Overview
Problem
Conventional circuit simulation tools are unable to evaluate small-signal stability during transient events in integrated circuits, which can lead to instability and failure during operation, as they only analyze stability at assumed steady-state operating points and fail to account for varying impedances and gains during transient conditions.
Innovation Solution
A simulation method and system that performs small-signal stability analysis at specific times within the transient response of a circuit, using previously stored transient simulation results as initial conditions to continue the simulation, allowing for evaluation of stability at discrete time points during transient events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circuit simulation tools perform stability analysis only at steady-state operating points, then the analysis is simple and computationally efficient, but the analysis fails to identify instabilities that occur during transient events
Solution Approach 1:
The patent performs preliminary transient simulation to capture circuit behavior at discrete time points before conducting small-signal stability analysis. This preliminary action of storing transient results as initial conditions enables subsequent stability analysis at multiple time points without requiring complete re-simulation, thus improving reliability while managing complexity
Solution Approach 2:
The patent segments the transient response into discrete time points for individual stability analysis. By dividing the continuous transient simulation into separate analysis snapshots, the tool can identify instabilities at specific moments without analyzing the entire transient period as a single complex problem
2Reliability
If the simulation analyzes stability at multiple time points during transient response, then potential instabilities are identified more accurately, but the computational time and resources increase
Solution Approach 1:
The transient simulation results are captured and stored in advance at discrete time points. These pre-computed results serve as initial conditions for subsequent small-signal stability analysis, eliminating the need to re-run the full transient simulation for each stability check and reducing overall computational time
Solution Approach 2:
The patent dynamically adjusts the analysis approach by using previously computed transient states as initial conditions for stability analysis at subsequent time points. This dynamic reuse of simulation data reduces redundant computations while maintaining accurate stability evaluation across multiple time points
Data Source
AI summary
Simulation method and system for analyzing the stability of a modeled electronic circuit. Simulation of the transient response to a desired input stimulus is performed in a piece-wise fashion, in a sequence of transient time points. At one or more user-specified time points (“tpunch” points) within the transient interval, the state of the circuit in the transient response at that time point is applied to the model as if it were a DC operating point, and the small-signal stability of the circuit under those conditions is analyzed. Transient instability of the circuit is thus discovered by way of simulation, allowing the designer to determine the cause and cure of that instability.