Matlab Simulator of an EMI receiver for Spread-Spectrum clocking applications

Compulsory international regulations impose/guarantee the electromagnetic compatibility (EMC) of any electronic device. According to these, EMC is linked with: i) the ability to fit the power spectrum of any interfering signal radiated/conducted by a circuit/system under a prescribed mask; ii) the ability of a circuit/system to withstand incoming electromagnetic interference at a given level. International regulations also require measurements to be taken with an EMI receiver, that is basically an analog spectrum analyzer with some additional input filters. Furthermore, they impose a prescribed setting measurements method. In order to investigate optimization of spread spectrum systems, we developed a simple but effective mathematical model of the EMI receiver. With this, we were able to find which modulation parameters set ensures, under the assumption that measurements are taken accordingly to international regulations, to maximized the EMI reduction. We are able to investigate both the standard triangular case, where we can determine the optimal triangular waveform frequency maximizing performance, and the random PAM modulation, where we can find which random signal statistical features ensure optimal performance