Extraction of noise current signatures using wavelets in packaged digital systems

This paper discusses a measurement-based approach for estimating the switching noise current waveform in a functioning computer system. The proposed method consists of a wavelet-based approach for denoising the measured waveform and a technique for capturing the result in an accurate and compact model. The method has been tested on simulated and measured data. The test case considered is a high-speed functioning workstation from Sun Microsystems. Using the current source developed, simultaneous switching noise in the power distribution network of the test system has been simulated with good accuracy