Scoped ESD Verification via Static and Transient Simulation
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Solution Overview
Problem
Current ESD protection verification methods, particularly in modern IC designs, face challenges in comprehensive analysis due to the impracticality of full-circuit simulation in SPICE and the difficulty in utilizing vast layout data, leading to inadequate time-domain analysis for robust ESD protection design.
Innovation Solution
The implementation of scoped simulation-based ESD verification techniques, which involve identifying ESD protection devices and I/O circuitry, performing static and transient simulations using SPICE, and analyzing results to identify protection problems, allowing for more accurate and efficient ESD protection evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-circuit simulation in SPICE is performed, then comprehensive ESD protection verification is achieved, but it becomes impractical due to large IC design sizes
Solution Approach 1:
The patent segments the large IC design into smaller simulation scopes by identifying specific ESD protection devices and their associated I/O circuitry. Instead of simulating the entire circuit, the method extracts and simulates only the relevant ESD protection paths and devices, making the simulation practical while maintaining verification completeness for ESD protection functionality.
2Productivity
If rule-based ESD verification is used, then fast analysis is achieved, but comprehensive time-domain analysis is insufficient
Solution Approach 1:
The patent transitions from static rule-based verification to dynamic transient simulation that captures time-domain behavior. By performing transient simulation on identified ESD protection devices, the method dynamically analyzes the time-dependent response of ESD protection circuits, providing both speed and accuracy through targeted dynamic analysis rather than exhaustive static checking or full-circuit simulation.
3Measurement precision
If vast layout data is utilized, then more accurate ESD analysis is achieved, but it increases simulation complexity and computation burden
Solution Approach 1:
The patent extracts only the necessary layout data relevant to ESD protection devices and I/O circuitry, rather than processing the entire vast layout dataset. By extracting point-to-point resistance values and detailed parasitic information specifically for the identified ESD protection paths, the method achieves accurate analysis while reducing data processing complexity to manageable levels.
Data Source
AI summary
Aspects of the disclosed technology relate to techniques of scoped simulation-based ESD verification. ESD (electrostatic discharge) protection devices and I/O (input/output) circuitry are identified in a circuit design. Static simulation is performed on the I/O circuitry to determine voltage and current information for devices on current paths in the I/O circuitry based on point-to-point resistance values. Transient simulation is then performed on one or more of the ESD protection devices in the devices based on the voltage and current information and detailed parasitic information. The point-to-point resistance values and the detailed parasitic information are extracted based on a layout design for the circuit design and cross-reference information between circuit component identifiers and layout features. Results of the transient simulation are analyzed to identify ESD protection problems.