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Sb Clock Spread Spectrum (Sb CSS) is a technique used in digital clocking systems to reduce electromagnetic interference (EMI) and improve signal integrity. It involves intentionally modulating the clock frequency slightly around its nominal value.
The spread spectrum technique spreads the energy of the clock signal over a wider frequency range, which helps to reduce the peak spectral energy at any specific frequency. This reduces the chances of interference with other nearby electronic devices and decreases the electromagnetic radiation emitted by the clock signal.
Sb CSS is particularly useful in high-speed digital systems where clock signals can generate significant EMI. By spreading the clock energy, it helps to meet regulatory requirements for electromagnetic compatibility and reduces the possibility of signal corruption or data errors caused by EMI.
Overall, Sb CSS is a technique employed to improve the performance and reliability of digital clocking systems by reducing EMI and enhancing signal integrity.