We present a spread spectrum clock generator for EMI reduction, where the modulating signal is generated by a suitably designed chaotic map. With respect to past solutions, the map has been designed to achieve a specific short-term behavior of the generated sequences, which allows to optimize the electromagnetic interference peak reduction not only for the theoretical spectrum, but also in the measurement setting prescibed by CISPR norms. In the latter case, we are able to achieve a 3.8 dB improvement in EMI reduction with respect to the triangular modulation when using the peak detector, which increases to 6.9 dB when switching to the quasi-peak detector. Results are measured on a prototype which has been designed and fabricated in a 0.18 um CMOS technology.
A Spread Spectrum Clock Generator Based on a Short-Term Optimized Chaotic Map / Pareschi Fabio; Setti Gianluca; Rovatti Riccardo; Frattini Giovanni. - STAMPA. - (2011), pp. 507-510. (Intervento presentato al convegno European Solid-State Circuits Conference (ESSCIRC2011) tenutosi a Helsinki (Finland) nel September 12-16, 2011) [10.1109/ESSCIRC.2011.6044933].
A Spread Spectrum Clock Generator Based on a Short-Term Optimized Chaotic Map
ROVATTI, RICCARDO;
2011
Abstract
We present a spread spectrum clock generator for EMI reduction, where the modulating signal is generated by a suitably designed chaotic map. With respect to past solutions, the map has been designed to achieve a specific short-term behavior of the generated sequences, which allows to optimize the electromagnetic interference peak reduction not only for the theoretical spectrum, but also in the measurement setting prescibed by CISPR norms. In the latter case, we are able to achieve a 3.8 dB improvement in EMI reduction with respect to the triangular modulation when using the peak detector, which increases to 6.9 dB when switching to the quasi-peak detector. Results are measured on a prototype which has been designed and fabricated in a 0.18 um CMOS technology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
