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10 de feb. de 2017 · Easy: buy a spread-spectrum oscillator! Here are a few options: p/n DS1086 from Maxim; p/n CY25701 from Cypress; p/n LTC6908 from Linear Tech . Conclusion . As you can see in the above comparison (taken from the LTC6908 datasheet), spread-spectrum clocking is a powerful yet easy-to-implement tool for reducing radiated EMI.
2 de ene. de 2020 · Spread spectrum clocking works by continuously modulating the clock signal around a particular frequency. This “ spreads out ” the power output and “ flattens ” the spikes of signal waveform, keeping them below the FCC limit. The PCIE Spread Spectrum BIOS feature controls spread spectrum clocking of the PCI Express interconnect.
In this chapter, spread spectrum clock generation (SSCG)-an advanced clock generation solution for electromagnetic interference (EMI) -is presented. EMI becomes critical as the clock speed and the degree of integration are increased. Various EMI suppression techniques are introduced in this chapter. Among EMI suppression techniques, SSCG is a simple but cost-effective solution since it ...
Unter Spread Spectrum Clocking (engl.), abgekürzt SSC, wird in der synchronen Digitaltechnik ein spezielles Taktsignal (engl. clock) verstanden, das elektromagnetische Störungen minimiert. Dabei wird das Taktsignal in einem bestimmten Frequenzbereich laufend variiert, es wird dabei künstlich mit einem so genannten Jitter versehen.
Spread spectrum clocking is a technique where the clock frequency is modulated slightly to lower the peak energy generated by a clock. Spread spectrum clocking lowers clock-generated EMI from both the fundamental frequency and subsequent harmonics, thereby reducing the total system EMI. Spread spectrum clock generator (SSCG) products support ...
Spread Spectrum Clock Generator ( SSCG ) 展頻時脈的技術是頻率調變 ( FM )的一種應用，相反地，頻率調變通常會伴隨產生展頻的效果。. 展頻時脈最基本的想法，是稍微地調變時脈訊號的頻率，造成時脈訊號的能量，分散到一個可以控制的小範圍內。. 在經過展頻調變之後 ...
In the CISPR-25 high frequency band, DRSS shows a peak reduction of 5–7 dB. Figure 3-3. Conduction EMI Reduction by DRSS (LM5156, Switching at 2.2 MHz) In the LM5156, DRSS is implemented with a ΔfC of fC × 5.5%, a ΔfPRSS of fC × 2.3%, and an fm randomized between 10 kHz and 16 kHz.
