• The MCLK Spread Spectrum BIOS feature controls spread spectrum clocking of the memory bus. Should I enable or disable spread spectrum?
  • ... The concept of spread spectrum modulation is based on the idea of using more bandwidth than the minimum required to transmit information.
  • FCC certification testing is often completed with the spread-spectrum function enabled in order to reduce the measured emissions to within acceptable legal limits.
  • Spread spectrum of a modern switching power supply (heating up period) incl. waterfall diagram over a few minutes. Recorded with a NF-5030 EMC-Analyzer.
  • Figure 10 – An expanded view of the 40 MHz spread spectrum signal tuned just below 40 MHz (38.4 MHz) so you can see the lower portion of the spread signal.
  • SB Clock Spread Spectrum is a method used to reduce electromagnetic interference by manipulating the frequency of a clock signal.
  • Figure 2: Non-spreading Clock and a Spread Spectrum Clock Measured by a Spectrum Analyzer with a 100 kHz Resolution Bandwidth.
  • Spread spectrum signals may be divided into two main groups - direct sequence spread spectrum (DSSS), and frequency hopping spread spectrum (FHSS).
  • If the required bandwidth for each station is B, spread spectrum expands it to Bss such that Bss » B. Spread spectrum achieves its goals through two principles
  • However, while enabling Spread Spectrum decreases EMI, system stability and performance may be slightly compromised.