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Real-time Noise Analysis

What is it?

Real-time noise simulates real noise in transient analysis. This is distinct from small-signal noise analysis (available in all products) which analyses the theoretical noise at a fixed bias point. Real-time noise is available in Elite versions of SIMetrix and SIMetrix/SIMPLIS.

How does it work?

When activated, real time noise sources are added to all noisy devices with a magnitude and frequency distribution calculated using the same equations used for small signal noise analysis. This allows noise analysis to be performed on systems that cannot be analysed using small-signal noise analysis such as sampled data systems, mixers and oscillators.

The plot shown below demonstrates the effect of real-time noise on the simulation of a 5-stage ring oscillator fabricated using a 180nm CMOS process. The green plot shows the phase jitter without real-time noise enabled while the red plot is with real-time noise enabled.

Who's it for?

  • Real-time noise is primarily of benefit to analog IC designers of RF circuits. It may also be useful for designers of PCB based circuits using discrete devices.