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Presented by: Peter Feldmann Bell Laboratories Murray-Hill, New Jersey
Joint work with Alper Demir
Modeling and Simulation of Interference due to Digital Switching in Mixed-Signal ICs
The digital switching interference problem
Outline
Review of circuit noise analysis
Noise modeled as stochastic processes
Stochastic processes in linear systems
Noise power spectral density expression
Circuit noise simulation
Digital signal modeling
Example
Modeling of switching activity
The interference signal
Cell switching supply currents
Cell switching substrate currents
Power spectral density of modulated signal
Individual cell contribution
Propagation of the noise
Analogy to a communication system
Example circuit
Comparison to Monte Carlo
Another comparison to Monte Carlo
Input and output power spectra
The effect of the switching activity
Cross-spectral power density of inputs
Effect of noise source correlation
Effect of including delay into the model
Efficient noise analysis algorithm
The connection to the PVL algorithm
Setting noise problem in PVL form
Setting noise problem in PVL form (cont.)
Noise analysis of a band-pass filter
Conclusions and Future Work
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