RTS Noise Modeling in Circuit Simulation
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Solution Overview
Problem
Current circuit design and simulation methods fail to accurately reflect the actual characteristics of integrated circuits (ICs) due to the difficulty in considering randomly generated random telegraph signal (RTS) noise from field effect transistors (FETs).
Innovation Solution
A method that involves receiving a netlist describing devices, performing arithmetic operations using RTS noise factors, generating an RTS model for each device, and outputting a modified netlist and model library that reflects the RTS noise, allowing for simulations that account for the noise's impact on circuit behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If general circuit simulation is used, then simulation speed and ease of operation are maintained, but accuracy in reflecting actual circuit characteristics deteriorates due to inability to consider RTS noise
Solution Approach 1:
The patent segments the simulation process into two distinct phases: a first simulation phase that excludes RTS noise for obtaining baseline circuit characteristics, and a second simulation phase that incorporates RTS noise for accurate characteristic verification. This segmentation allows each phase to serve its specific purpose without unnecessary complexity.
Solution Approach 2:
The patent performs preliminary determination of RTS noise information for each device before conducting the accurate simulation. By pre-calculating and storing RTS noise characteristics (such as noise magnitude, correlation time, and device-specific parameters), the system prepares noise models in advance that can be efficiently applied during the second simulation phase.
2Reliability
If RTS noise is incorporated into simulation, then reliability of circuit design improves, but device complexity and calculation burden increase
Solution Approach 1:
The patent changes the simulation parameters by introducing RTS noise-specific parameters (noise magnitude, correlation time, device operating conditions) while maintaining the underlying circuit topology and basic device models unchanged. This selective parameter modification allows accurate noise modeling without requiring complete redesign of the simulation framework.
Solution Approach 2:
The patent introduces an intermediary processing step that generates RTS noise models based on device characteristics and operating conditions. This intermediary layer translates physical device properties into simulation-ready noise parameters, bridging the gap between accurate physical modeling and practical simulation implementation.
3Measurement precision
If RTS noise modeling is performed for all devices, then measurement precision improves, but loss of time increases due to extensive calculations
Solution Approach 1:
The patent applies partial action by determining RTS noise information for only those devices where it significantly impacts circuit characteristics, rather than uniformly applying complex noise modeling to all devices. This selective approach focuses computational resources on critical components while maintaining overall simulation efficiency.
Data Source
AI summary
A simulation method includes receiving a netlist describing a plurality of devices, performing an arithmetic operation by using values of random telegraph signal (RTS) noise factors respectively corresponding to the plurality of devices, generating an RTS model corresponding to each of the devices, based on a result of the arithmetic operation, and generating a netlist in which the RTS model is reflected.