Pnoise Circuit Simulation Full Spectrum Accuracy
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Solution Overview
Problem
Current circuit noise simulations, particularly for RF circuits, face computational challenges in accurately modeling the contributions of numerous sidebands, leading to potentially inaccurate results due to the high computation cost and complexity, especially for complex circuits where non-negligible sidebands beyond the initial few are ignored.
Innovation Solution
The method decomposes noise contributions into flicker and white noise components, determining the output noise associated with flicker noise using a small number of sidebands in the frequency domain and white noise across the entire frequency domain, allowing for a full-spectrum Pnoise analysis with reduced computational effort without sacrificing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of sidebands are simulated to achieve accurate total output noise, then measurement precision is improved, but computation time increases significantly
Solution Approach 1:
The patent segments the total output noise calculation into two distinct parts: flicker noise contribution (calculated using a small number of sidebands) and white noise contribution (calculated using infinite sidebands). This segmentation allows each part to be computed with appropriate precision and computational resources, resolving the contradiction between accuracy and computation time.
Solution Approach 2:
The patent changes the parameter of sideband quantity from a uniform large number to a differentiated approach: small number of sidebands for flicker noise and infinite sidebands for white noise. This parameter change enables accurate simulation without the computational burden of uniformly simulating all sidebands with high precision.
2Productivity
If the number of sidebands is reduced to decrease computation time, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
By segmenting the noise calculation into flicker and white noise components, the patent enables productivity improvement through reduced sideband simulation for flicker noise while preserving accuracy through complete sideband simulation for white noise. This segmentation allows designers to achieve both goals simultaneously.
Solution Approach 2:
The patent applies partial action by simulating only a small number of sidebands for flicker noise where excessive precision is not needed, while applying excessive action by simulating infinite sidebands for white noise where complete accuracy is essential. This balanced approach optimizes both productivity and precision.
3Device complexity
If a small number of sidebands is used for simulation, then computation complexity is reduced, but reliability of results deteriorates for complex circuits
Solution Approach 1:
The patent segments the simulation approach based on noise type and circuit characteristics, applying different sideband simulation strategies to flicker and white noise. This segmentation ensures reliability for complex circuits by using appropriate sideband quantities for each noise component while managing overall computation complexity.
Solution Approach 2:
The patent dynamically changes the sideband parameter based on noise type and circuit complexity: using a small number of sidebands for flicker noise in complex circuits to reduce computation complexity, while using infinite sidebands for white noise to maintain reliability of results.
Data Source
AI summary
An apparatus and method for performing periodic noise (Pnoise) simulation with full spectrum accuracy is disclosed herein. Noise contributions of a circuit under consideration are identified and separated for different computation treatment. The different computation treatment results in computational efficiency without sacrificing accuracy of simulation results.